Torque Converter Vibration Under Load

Mostly noticeable while driving under load at specific rpm. I have been having a vibration from under the truck - finally pinpointed when it happens. The Centering Sleeve (or guide bushing) # 26 11 7 526 611 is the bushing the installs into the nose of the driveshaft and it centers the forward end of the driveshaft on the end on the transmission output shaft. The stall speed STOPPED is OVER 2500RPM, so if what they claim is true, you'll have a 3,000 stall convertor. Dimensional analysis was applied to test results from a matrix of torque converters that ranged from populations comprised of strict geometric similitude to those with more relaxed similarities onto inclusion of all the. A standardized test procedure for the stall operating condition was developed to transition each torque converter tested from a noncavitating to cavitating condition. Under AFFECTED VEHICLES, moved 2014-15 RLX to 16-065, 2014-15 RLX: Judder from the Torque Converter Lock-Up Clutch because a software update is available to address this issue. The ZF-Powershift Transmission 4 WG-92/98 TSC is composed of a hydrodynamic torque converter and a rear-mounted multi-speed powershift reversing transmission with integrated transfer case (see Table-1). 8 Just in case drive line carrier bearing What i have Vibrations completely GONE!!!. Bad vibration. The "vib" causes a droning hum to the entire inside of the truck almost like driving on the rumble strips on the right side of the road that wake you up if your veering off, but not violent shaking. Torque: ? ft. full engine load curve. Whether you require fluid couplings or a customized drive package, Voith is your partner of choice. Thrust bearing overloading can be caused by any number of problems, including poor crankshaft surface finish (too rough and/or wavy), excessive “riding” of the clutch pedal, improper clutch release bearing adjustment, excessive torque converter pressure or an improperly mounted front crank-driven accessory (a/c compressor, power steering. Only when vehicle is moving and only under load. I’ve checked the driveshaft, and it only has a small amount. Almost sounds like rod knock, but I just put the engine in and its been doing it since i first started it up. Google discovery 3 torque convertor vibration issues, cheap fix that works is 2 tubes of Dr Tranny from ebay. Also had the front diff fluid changed (at great expense). I assume it to be the clutch plates on the torque converter but not sure if that. My Ford has 113K miles on it. correct torque settings on connections. As soon as I was out of the throttle it would return to normal the vibration would go away. The unit mounting eliminates misalignment of the torque converter drive belt. The amount an engine is allowed to overrev before it's torque is reduced for a natural redline. In a vehicle with a known good torque converter, Engine Speed, Input Shaft and Output Shaft speeds will all be smooth. CVJ loose or failing- check by doing left and right figure 8 turns at low speed in a parking lot. I also seen where people recommended using tranny dr insta shudder fix. Tried unbolting the torque converter and running it and the vibes are still there. Welcome to the world of fuel efficient four bangers. The basic function of torque converters is to multiply torque so as to cope up with the reducing rotational speeds. I believe it's either the torque converter or flexplate. A Torque Static 5. Runs like a top. The shudder from the torque converter isn't good. VERY INTERESTING! Thank you for the info. 2006 Ford Expedition. Just an efficiency issue. then its gone. The vibration is likely the Torque converter lockup clutch chattering under load, which is going to cause accelerated wear, and the wear pattern caused during this chattering may tend to make the clutch chatter more likely or less likely to occur in the future. E46 vibration - in gear and at a complete stop Results 1 to 6 of 6 Discuss E46 vibration - in gear and at a complete stop in the alt. Draw converter bolts up evenly so as not to pull converter into a bind causing vibration and pump bushing failure. 039 oz -in/A. I am thinking of buying a SBC/TH350 260Z (looks like JTR mounts) and drove it last night. The lower the value, the faster the engine can rev. I told the tech about vibration and results of shaft swap and he said it was my torque converter slipping due to dirty fluid. It had the torque converter replaced 2X, the motor mounts, the entire transmission replaced, the transmission mount and a few other. I’ve spent literally days online researching the rumble strip issue, and now trying to find out more about how to best deal with the code. Without slip it cannot transmit torque. TCC is the transmission converter clutch. Gooberboy. I've done king pins(1 1/2 yr ago);hanger,leaf springs bushings(1yr ago);all shocks;carrier bearing,;all u-joints;steering gear box(had too much play);alignment;balanced steers and bought centramatics. My vibration was there from purchase (28K on odom. The TS200 and TS300 Test Stands from Great Lakes Power provide a turnkey solution to testing automatic, powershift, marine, and oil field transmissions, torque converters and any other engine flywheel mounted products. Previousely I didn't feel any vibration at speeds other than 20mph; then sometime between 1 and 2 I started to feel vibration while applying torque at higher speeds (60-70, etc) and it got a bit less wild at 20mph. One gram-force millimeter is equal to the torque resulting from a force of one gram-force applied perpendicularly to a one millimeter long moment arm. A Torque converter ain't really doing too much untill you're at highway speeds of above about 42mph. This system eliminates rope wear and damage while assuring extremely accurate load detection. At least that’s what the tech told me. I took mine to a busy auto transmission shop. Finally the backordered torque converter came in and the van was put back together. In modern day converters this theoretical ratio is anywhere between 2:1 and 3:1. 4 and 4R70W, with 226K miles. i haven't been under the car yet, so bare with me. Vibration/Torque Converter Failing. 8 Just in case drive line carrier bearing What i have Vibrations completely GONE!!!. One of the most common cause of driveline vibration are worn U-joints or slip splines, out-of-balance components, yokes out of phase or misaligned angles, approaching critical speed range, and yoke ears that are not concentric with the. A few things come to mind: * A bad vibration damper on the crankshaft. If you take all three torque converter bolts out and rotate the converter one bolt hole and then re. 039 oz -in/A. One gram-force millimeter is equal to the torque resulting from a force of one gram-force applied perpendicularly to a one millimeter long moment arm. 700R4 won’t shift. Converter Hydrodynamic torque converters have at least three vane wheels (main parts) that redirect the flow: the pump, turbine and reaction member, also called a guide wheel. /h A Second order driveshaft vibration will cause two shakes. Transmission/torque Converter Problems The Nitro has been in for the third time to fix the shudder. thanks in advance Ric. p for Zero Friction Under. 99 times out of 100 it doesn't happen at all. I was lucky. However cyclic load changes in start-up and slow-down of the hydrodynamic torque converter operation have been beyond access to the current flow field calculation methods due to the extensive computer run time and memory requirements in the application of time dependent. Torque converter structures closer to the dual mass structure are therefore under development. I picked up the van and was excited the have the problem solved at no. A proper inspection. The shudder from the torque converter isn't good. (3) There will be no more worries about overheating the transmission in heavy traffic or hot weather pulling a heavy load due to the fluid shear of a poorly designed torque converter. The unit mounting eliminates misalignment of the torque converter drive belt. Now that you know what a torque converter is; let’s move on with understanding lock up torque converters. In this paper, the constraint and threshing modals of the threshing cylinder were tested under idling and load conditions, and the causes of vibration and modal variation were explained. In high torque, high-load situations, the torque converter bears the brunt of the engines force. " I question their conclusion because the vibration only occurs under load and I would not expect the econ mode to come on only in that narrow 20-25 range no matter where the car is in the gear range or rpms. This calculator will calculate torque given the lead screw parameters and the required force. a good shop will have an oscilloscope that can be used to check out the coils at normal use and under a load. Mine started doing it today under similar circumstances as others; 45-55 mph under load wile going up a long hill. Whether you require fluid couplings or a customized drive package, Voith is your partner of choice. If you press the brake pedal lightly or shift out of overdrive the shudder will quit. See all problems of the 2010 Chevrolet Traverse. For example, torque converters lock up at highway speed for better fuel mileage. Vibration under load Under load (the more torque, the more shake), the front vibrates. The dealer has been great but their hands are tied. Dealer found source of leak to be a bad Torque Converter. In this case, we’d expect the 234-degree duration to draw down the stall by 200 rpm, and the lobe separation will further weaken the torque at idle, dropping the stall an additional 200 rpm. Under these conditions, up to 10% of the engine's output power could be lost to the torque converter's internal slippage. We released converters with a tighter fit on that spline, which eliminates the noise. Draw converter bolts up evenly so as not to pull converter into a bind causing vibration and pump bushing failure. In 4th gear, overdrive, under load the transmission will shudder. 1998 Chevy K1500 4X4 5. The development of the parameter identification algorithm is presented in Section Proceedings of the 20th World Congress The International Federation of Automatic Control Toulouse, France, July 9-14, 2017 Copy ight © 2017 IFAC 4924 On-line Identification of a Torque Converter Model Kirti D. The GM instructions are to drive it at least 200 miles but the difference was immediate. In 4th gear, overdrive, under load the transmission will shudder. It's right there in the fault code: "01192 - Torque Converter Lock-Up Clutch. If you're looking for the next big thing, FUTEK has a library of over 100 new and innovative ideas to incorporate its load cells, torque sensors, pressure sensors, and multi-axis sensors. Is anybody else had/having this issue with the 3. I believe torque converter shudder is typically associated with light throttle and the upper gears. Home > SHOP Transmissions > Ford Transmissions > 4R70W, 4R75W, 4R75E (04-08) In 2003, Ford made improvements to the 4R70W with features such as more lugs for the output shaft sensor to read off of, a new torque converter, a new front pump assembly, and a vehicle speed sensor. headers, new harmonic balancer, trw pistons, scat rods. Ford Transmission :: Torque Converter Shutter Or Vibrate Under A Light Load My 1996 F150 has developed a strange vibration and nothing i have done seems to work. The stall speed is the rpm range where the torque converter begins to transfer power to the transmission. Other than that the transmission works fine, I don't notice any slipping. What is the Connection Between Failing Torque Converters and Vibration? 6. Vibration in a driveshaft can be caused by many conditions. As some have described, it was like going over rumble strips. It was explained to me that while the torque converter and transmission are covered under the CPO, the first step in diagnosing (the transmission flush) is not. Two common ways to measure stall speed are foot-brake stall and flash stall. It didn't get better or worse, just more annoying and easier to replicate. 3 liter engine and the allison AT545 Transmission, am not certain of the mileage on it because the cluster was broken hence it shows an inaccurate reading of 54000 miles. Mishra ∗ Krishnaswamy Srinivasan ∗âˆ. I also checked if torque converter of flex plate loose. 3Hz and the amplitude 50Nm. 3 GMC Sierra - Duration: 1:36. Mechanical and Electrical, since the converter clutch only ingauges under certain load conditions of the vehicle, probrably what is happening is the torque converter clutch is staying engaged. However, if the load is heavy even while the vehicle is running at a medium or high speed, the torque converter may operate in the converter range. A component rotating the same speed as the driveshaft that is out-of-round. It's putting quite a bit of load, at very low RPMs, on an engine configuration that's already prone to a rough idle. The manual says "some models" have a lockup torque converter with an electronic clutch that kicks in at 40 mph under light load…which is the exact conditn where I started hearing/feeling the vibe rumble. There is a slight increase in vibration, which might be why it is commanded to slip a little. I believe it is the original. Upshift and it goes away until that RPM is reached again. then it goes away. Rebuilt waterpump and power steering pump. A load cell under the bolt head can be used, however it is not as accurate as strain gauging, since the joint characteristics have been changed. The transmission seems to shudder when driving on the highway in top gear. Anyway, any education you can give me on the workings of this torque converter would be appreciated. According to Hughes Performance, torque converter stall speed is the maximum amount of engine rpm that can be achieved in an automatic transmission-equipped vehicle while the transmission is in a forward operating range without generating any driveshaft motion. 1-3, an improved torque converter assembly 24 enhances vibration isolation by providing an arrangement that enables a fully flexible effective spring rate, as described herein, that can result in achieving a desirable, predetermined amplitude of torsional vibration PVA at a lower engine speed than with a conventional. The belt should be straight in the sheaves. I drive a 1999 MGM (with 75k miles on it). Komatsu SmartLoader Logic reduces the clutch engagement shock of lock-up by. This cam will directly affect the stall in the torque converter by its duration and lobe separation. Strange thing is it seems to come and go,thought it was gone after the cats were replaced but as i said it comes and goes. That's when the stock torque converter locks in 4th and 5th gears. Some vehicles may exhibit a drone (audible noise) and a tactile vibration in the steering wheel (higher frequency buzz) at 1350 - 1400 rpm (40-45 mph) under a light load with the torque converter locked in 3rd or o/d. Transmission fluid dripping from bottom of the vehicle. Eureka! There is a known issue with some 06 Civic models concerning a resonance/vibration at 1,500 rpm, between 29 and 40mph. Under normal city driving condition, the temp gauge will usually read around 150 (not operating temperature). No play in driveshaft. One of the techs took a ride with me and as we were pulling out I was explaining what happens. We changed the ignition coils and spark plugs, transmission fluid, oil changed, and got the catalytic converter checked and it test fine. The ATS 3029302164 TripleLok Torque Converter for your 94-07 Dodge 5. Worldwide Electric Variable Frequency Jcb Torque Converter , Find Complete Details about Worldwide Electric Variable Frequency Jcb Torque Converter,Jcb Torque Converter,Torque Converter,Frequency Converter from Inverters & Converters Supplier or Manufacturer-Zhejiang Jarol Scientific Instrument Co. Sometimes its bad enough to rattle the dash. Tried swapping tires with new spare and there was no change. The following calculators compute the various torque aspects of motors. Mechanical and Electrical, since the converter clutch only ingauges under certain load conditions of the vehicle, probrably what is happening is the torque converter clutch is staying engaged. Although the negative slope in friction–velocity characteristics. I don't have the knowledge to give you a definitive answer but torque convertor lock up occurs at about 50 mph in top which is where you say the vibration occurs, I'm guessing, but a failing clutch in the torque convertor of an L322 can produce vibration so it may be possible that the same could happen in the P38 box even though the operational mode is a bit different. This function is best suited for the equipment that requires stable speed such as a cutting machine. I'm at 54k miles, so not much time left. Vibration in flexplate/TC causing major vibrations at high RPM in neutral and in gear. Most likely it's not from t. I suspect the centre bearing may be the culprit but I am still not convinced the wheel bearing/s aren't involved yet. Our load cell offering includes competitively priced general purpose and fatigue rated load cells, which come in a variety of mechanical configurations such as single or dual bridge, low profile, canister, rod-end, and s-beam load cells — all of which provide excellent accuracy at an affordable price. 6 Plot of A Torque Vibration vs. Is anybody else had/having this issue with the 3. Vibration/Torque Converter Failing. If you have any questions about this relationship, or how the theory applies to a ‘real-world’ motor, please contact our sales engineers to help with your application. The vibration damper, thrust washer, and hub are secured in a fixed position with respect to one another. If you are using inferior OE torque converters with your performance package you are, in essence, wasting that power. They began by replacing the torque converter; however, after about three months, the problem began again. " I question their conclusion because the vibration only occurs under load and I would not expect the econ mode to come on only in that narrow 20-25 range no matter where the car is in the gear range or rpms. This calculator will calculate torque given the lead screw parameters and the required force. And it seems to vibrate most severly when driving in 4th gear under 3k rpm. This disturbance will increase as the suspension moves further from its design load (typically two front passengers). After a lot of test drives, a lot of thinking reading and a few phone calls to a reputable trans shop I have come to the conclusion that it is the lock up clutch in the torque converter. Mechanical and Electrical, since the converter clutch only ingauges under certain load conditions of the vehicle, probrably what is happening is the torque converter clutch is staying engaged. To fix, the torque converter has to be replaced. My vibration was there from purchase (28K on odom. I disconnected the converter and ran it, vibration gone. The lock-up torque converter, combined with Komatsu SmartLoader Logic, results in low fuel consumption and high travel speeds in load and carry, and even some V-cycle. Bad vibration. I recently changed my trans and torque converter fluid with factory spec fluid, did the DARF mod, changed the rear end fluid as well. it has two problems. Ignition issue- one cylinder misfiring- any CEL or codes ? 2. PCB Load & Torque, a division of PCB Piezotronics, Inc. However, I've noticed that at low speed cruise (55 and below), when the torque converter clutch engages, there is a terrible shudder, basically it feels like driving in a rutted out dirt road. tranny/torque converter ? 1992-1996 Ford F150. I would say between 2nd and 3rd gear. I have no issue currently under moderate acceleration or towing or running at high way speeds. first scan and fix whats in front of your face. The lockup torque converter, used in OBD-II equipped vehicles, allows the engine to lock into the transmission input shaft under certain conditions. Re: "Rumble Strip" Vibration Sep 30 2014, 5:01pm After reading the first thing that came to mind was Torque Converter, my brothers Focus does this same thing only the convert cost more then his car is worth so he's just driving it into the ground…. Dealer found source of leak to be a bad Torque Converter. A lockup solenoid is sometimes referred to as a torque converter clutch (TCC) solenoid, since it is essentially an electric valve that a transmission control unit (TCU), or engine control module (ECM), can use to directly control the torque converter. What happens here is when the torque converter is unable to do this partial application, it will slip until there is enough friction to engage normally, which when this happens is usually about 75% engagement. It's most easily. Now when you shift into either reverse or drive, and you have your foot on the brake, the engine is lugging under a load as it is trying to rotate the transmission through the torque converter (I am assuming the CVT still has a torque converter) but the brake is holding it back. , the vehicle is operating under an appropriate load, at an appropriate speed, in the appropriate gear, and at the proper. • A remanufactured and improved torque converter is included with every transmission. I don't get any shudder or surging though. Original owner. It turned out to he the leaf springs when under big torque would allow the pinion angle to rotate up enough to throw it off and cause a vibration. It was happening more consistently in 4wd, however, would also do it in 2wd going uphill. No lights came on during this 3 hour trip and the torque converter was locking and unlocking the entire way. I have already replaced both cv axles. A shudder or vibration may develop while driving at speeds between 35 and 40 MPH. Response Number 1: Name: fred ont canada Date: February 23, 1998 at 10:02:21 Subject: Torque Converter -- Bad Vibrations? Reply: Bob what you are discibing is a mechanical vibration has nothing to do with pressure. I am thinking of buying a SBC/TH350 260Z (looks like JTR mounts) and drove it last night. Under normal city driving condition, the temp gauge will usually read around 150 (not operating temperature). Now it is doing it with the heater on a/c off and in park or foot on brake. Once the 5th gear slippage problem is eliminated, the singe disc torque converter clutch begins to slip. The torque converter is locking in at too low of an RPM and therefore trasferring the uneven firing of the engine pistons into a vibration that can be felt in the cab. Without slip it cannot transmit torque. My Plymouth has a 318 with Torqueflite and double WCFB's. Although there are various types of pressure transducers, one of the most common is the strain-gage base transducer. I’ve checked the driveshaft, and it only has a small amount. Designed with heavy haulers in mind, our torque converters excel in their capacity to remain trouble free under high load applications like towing heavy trailers or long distance. A torque converter noise will increase under this load. When I went to check the torque on the Torque converter/ flexplate for the 35 pounds of torque, 3 bolts were good and 3 were very loose. When under load, at max vibration, there is another higher frequency “rattle” that comes it that sounds like it’s coming from under the dash somewhere, it seems secondary. Have had many other repairs ($3000) in 6 years also , making this CRV the most expensive repair cost vehicle ever owned in 40 years of driving. A torque converter will provide a range of stall speeds based on the amount of load that is placed on the torque converter. The labor cost to replace the torque converter is between $200 and $1000, depending on the vehicle model and the workshop that does the work for you. If the judder returns after updating the vehicle, the torque converter may need to be replaced. The torque converter has been replaced, the computer flashed numerous times, and all TSB's performed including recall G25. The stall speed is the rpm range where the torque converter begins to transfer power to the transmission. My Plymouth has a 318 with Torqueflite and double WCFB's. I have a 2018 Chevy Silverado double cab LTZ 5. Traveling at interstate speeds (50-60 mph), as the suburban starts up the hill, it struggles to maintain power and speed begins to drop. Check for fluid leaks. * A damaged flywheel, or clutch plate. When subjected to this vibration, the vehicle experiences a shudder type disturbance, generally occurring less than 25 mph. There are some outfits that rebuild torque converters in Europe; would end up being about half the price including shipping. The converter pilot is broken, damaged, or fits poorly into the crankshaft. If I remember, the cost to fix just the tranny was $3200, presuming it was the torque converter. I'm not trying to start a prolonged argument, but many people have complained that driving in 5th gear under very light load between 45mph-50mph, the RPMs pulse. Circuit Building, DC Motors, DC. The gear changes are smooth, but it does seem to go into overdrive a little too quickily. Vibration/Torque Converter Failing. ISSUE IF QUESTIONS STILL ARISE AFTER REVIEWING Vehicles equipped with an AODE or 4R70W THIS TSB ARTICLE, CALL THE LIVONIA transmission (refer to Vehicle Application Chart)TRANSMISSION HOTLINE AT (800) 821-5046. ) in his 66 mustang. Load Torque: For a fixed voltage, the speed of the motor is inversely affected by the load. We were going to check the engine mounts, but the dealership told us it was a problem inside the engine. I has a complaint with my truck ( 93 Ford F150 4. 1 1 Comparison of p-Values for Fastener Size 6. A torque converter is generally a type of fluid coupling capable of producing torque. , the vehicle is operating under an appropriate load, at an appropriate speed, in the appropriate gear, and at the proper. I've done king pins(1 1/2 yr ago);hanger,leaf springs bushings(1yr ago);all shocks;carrier bearing,;all u-joints;steering gear box(had too much play);alignment;balanced steers and bought centramatics. I have started to notice a vibration when driving over 80-90km/h. driveline noise / vibration while under very heavy load @ 70-80 MPH A couple weeks ago, I started to notice a slight driveline noise under heavy load (while pulling my trailer up hills). Re: 2003 XC70 - Vibration under Load Post by chrism » 27 Apr 2016, 21:14 If I was ever in a situation where my car had aftermarket axles and one went bad, I'd consider going to the PnP and pulling an OE axle to send in for rebuild. The stall stage is the initial phase of the torque converter wherein the load is provided with a sufficient amount of power to start and synchronize the speed between the pump and turbine. The torque converter has been replaced, the computer flashed numerous times, and all TSB's performed including recall G25. I doubt the blower motor causes as much of a load as the a/c. Original owner. Although this arrangement sacrificed some of the smoothness that was the main rationale for early automotive torque converter transmissions, it made Ultramatic more efficient than the early Dynaflow, at least. I don't see why thou , the way it is now the torque converter is still slipping when the box hooks another gear. VERY INTERESTING! Thank you for the info. It didn't get better or worse, just more annoying and easier to replicate. friction: number: false: na. I stopped by a transmission shop today and he suggested my problem may be the torque converter. starting torque ideally matched to the needs of the driven machine. In contrast, OE apply pressures range. The sound is similar to piston slap, i. Torque converter structures closer to the dual mass structure are therefore under development. tranny/torque converter ? 1992-1996 Ford F150. 3 with a 6 speed trans and two wheel drive I have a vibration in the steering wheel that I noticed when I bought the truck used with 16,000 miles I have had it back to the dealer 3 times and so far they have changed the torque converter, road force balanced the tires,Installed new motor mounts and. Traveling at interstate speeds (50-60 mph), as the suburban starts up the hill, it struggles to maintain power and speed begins to drop. A torque converter is a tunable device. When it happens the tach and speedometer needles both move up and down a little in unison (about 100 RPMS). I notice that it is most noticeable when the engine is under load. I want to know if and how the flushing could have ruined the torque converter / clutches. I'm having the same problem vibration under load over 70 and goes away around 90 mph, I have taken it to the dealer and they couldn't find any issues other than maybe a tire. I took mine to a busy auto transmission shop. Place your foot firmly on the brake pedal, and place the transmission's shift selector in Drive. Thrust bearing overloading can be caused by any number of problems, including poor crankshaft surface finish (too rough and/or wavy), excessive "riding" of the clutch pedal, improper clutch release bearing adjustment, excessive torque converter pressure or an improperly mounted front crank-driven accessory (a/c compressor, power steering. Early torque converters always had some slippage, so in the late 1970s and early 1980s manufacturers added a lock-up clutch to the torque converter. The manual says "some models" have a lockup torque converter with an electronic clutch that kicks in at 40 mph under light load…which is the exact conditn where I started hearing/feeling the vibe rumble. If you blip the throttle in park or neutral, you might hear a quick succession of knocks. Discuss it at Forum. 99 times out of 100 it doesn't happen at all. under "Application Guidelines" on page 8, and for Ten Series using the Driveline Sizing graph. Took it to the dealer three times. Find the appropriate interaxle driveline series for SPL using the Driveline Sizing graph. Symptoms consist of shudder, vibration, delaged engagement in first and or reverse, exhaust droan, surging under light load, premature failure of engine mounts, soft brake pedal feel at stops, Honda uses a variable apply torque converter. 8L, stow-n-go, 200k. Drivers of the SS A8 eight-speed Camaro have reported experiencing a shake or shudder between 25 and 80 mph while the transmission is changing gears. But really, the problem is simply the noise. I cruise along at between 45 and 55 mph with the transmission in OD and torque converter locked up, rpms between 1400 and 1600. This is actually a known issue in MDX models and the recommended repair is to replace the torque converter and install a software update for the power train control module. 2011 Subaru Outback. I don't get to drive this car a whole lot, but I've been home from school for a stretch this summer and I've started to notice a drivetrain shudder. Torque Converter Clutch. The reason for this new posting is that I just found the owners manual and read it. He found that 3 motor mounts were busted. His other comment was not to fix or overhaul the transmission until it stops working. Instead of using a clutch to engage and disengage the engine's torque from the gearbox, traditional autos keep the drivetrain connected at all times by using a torque converter. 700R4 won't shift. This was at around 63K miles. Turning on the A/C does the same. • NO — Go to step 10. The proportionality constant relating current to torque load is the torque constant (kM), in this case, 1. Does the it fell the same at different speeds?. It is not a constant vibration, more like a pulse. I want to know if and how the flushing could have ruined the torque converter / clutches. The labor cost to replace the torque converter is between $200 and $1000, depending on the vehicle model and the workshop that does the work for you. I have already replaced both cv axles. torque converter 2212502202 I find the torque converter the most likely suspect in my case, as well. I doubt the blower motor causes as much of a load as the a/c. It was explained to me that while the torque converter and transmission are covered under the CPO, the first step in diagnosing (the transmission flush) is not. Well, any vehicle may be, at about 35 mph or less; but the clutch in a manual, or the torque converter in an auto, are not meant to sit still while the driveline turns at speed, and seals, etc. Failed torque converter: Do Torque Converter Stall Test. The converter pilot is broken, damaged, or fits poorly into the crankshaft. If the noise is heard while transmission is in partial lock-up at 1400 - 1700 RPM, put the vehicle into ERS - Tow/Haul mode (deactivates MDS and torque converter in full lock-up) If the noise is. For the last year or 2 the car seems to make a shudder/vibration feel when I get to 40-45 mph at a low rpm (probably under 2,000 rpm). We assist you in gently accelerating your driven machine, owing to the hydrodynamic principle, thereby extending the life time of your system. Start your engine Press the brake pedal all the way to the floor and start. Tapping on the brake pedal will make that chatter occur again. Using VFD for speed regulation will obtain a substantial energy saving rate. However, vibration problems can happen when these torque converters go bad. Google discovery 3 torque convertor vibration issues, cheap fix that works is 2 tubes of Dr Tranny from ebay. I'm not trying to start a prolonged argument, but many people have complained that driving in 5th gear under very light load between 45mph-50mph, the RPMs pulse. Normal Torque converter lockup vibration. The converter pilot is broken, damaged, or fits poorly into the crankshaft. 07 Pete 379, C15 Acert with around 700,000 miles. I am now experiencing a rumbling sound and vibration from 30 – 40 mph and a high frequency vibration that is noticeable at higher speeds. I doubt the blower motor causes as much of a load as the a/c. Most auto repair shops will charge someone anywhere from $600 to $1000 for a torque converter replacement job. well I would look at a few things that may be possible: 1. I am considering having an indie replace it. While under a load my has a heavy vibration. I was directly under the TC and it was noisy right above me. Also kind of a drone from the vibration. POSSIBLE CAUSES For 2WD and 4WD vehicles, the calibration VCM operation combined with the action of the lock up torque converter creates excessive vibration. I took it to the tire shop to have it checked and they did come back with an out of balance tire but it didn't fix the problem. Torque Converter Clutch Shudder. " Yeah the TC is just a hydraulic coupling, but the TCC is a clutch, and slipping clutches are bad. This system eliminates rope wear and damage while assuring extremely accurate load detection. This is actually a known issue in MDX models and the recommended repair is to replace the torque converter and install a software update for the power train control module. Based on the indirect principle of hydrodynamic power transmission invented more than 100 years ago by Hermann Föttinger, torque converters are used to optimally adapt the characteristics of a driver to the needs of the driven machine. I disabled torque converter clutch completely in 1st, 2nd, and 3rd. The engine’s rotational power needs a torque converter in order for this torque to be transmitted to the vehicle’s transmission system. The problem is that the engine and transmission are vibrating when engine runs under load - for example when transmission upshifts (any gear) or when driving uphill. Does anyone have any experience with problems of shimmying or vibrations at speeds around 60 to 75 Km per Hour. Check for fluid leaks. One of the most common cause of driveline vibration are worn U-joints or slip splines, out-of-balance components, yokes out of phase or misaligned angles, approaching critical speed range, and yoke ears that are not concentric with the. He knew the bulletin number by heart and new the procedure. Damaged Wheels. PCB Load & Torque, a division of PCB Piezotronics, Inc. Took it to my dealer and they diagnosed it as a torque converter issue. once it has shifted into drive it will shutter or vibrate under a light load. A torque converter shudder is a brief shake or shudder in the vehicle when internal clutches apply inside the torque converter. 7 days in shop. A torque converter is the fluid coupling between an engine and transmission that allows the engine to idle at low speed without engaging the transmission. If you use a timming lite hooked. You can replicate this at any speed on the highway; Keep your foot into it until you know it's locked in 5th under load, lift off to coast , reapply slight pressure to the throttle and watch your RPMs blip for 3-4 seconds until the lock re-engages. Get right under there and I'm pretty postive it's coming from the torque converter. I checked the fluids they seem. The torque converter is locking in at too low of an RPM and therefore trasferring the uneven firing of the engine pistons into a vibration that can be felt in the cab. The lower the value, the faster the engine can rev. The torque converter doesn't slip especially since it would be a lock up torque converter however it would need to be at a certain rpm in order for the lockup to occur. Vech is going into econ mode at that speed (3 cylinders) and the feeling is the torque in between gears (at that speed) Condition is normal. Under high load, low RPM situations, such as accelerating in OD (torque converter locked up), there is a vibration, I can feel it through the floor and even up through the steering wheel. Have had many other repairs ($3000) in 6 years also , making this CRV the most expensive repair cost vehicle ever owned in 40 years of driving. Does anyone have any experience with problems of shimmying or vibrations at speeds around 60 to 75 Km per Hour. Lead Screw Torque and Force Calculator. I was directly under the TC and it was noisy right above me. I have a 1993 Suburban, 1/2 ton 4WD with the 4L60E transmission. If vibration on lift, which means minimal load on tranny/torque converter, check injectors, coilthings that when strain is put on engine and cause it to not perform when load is applied to it, until the rpm raises enough to over come the strain. And it seems to vibrate most severly when driving in 4th gear under 3k rpm. when that fails would that be causing vibration only when VCM is engaged? Because. Someone drilled 3 holes inboard of the 6 to mount the converter, they are so close to the outer holes they intersect. Well yesterday I had about enough of this crap and stop by the dealer again. I checked the rear differential fluid and it's fine. I just had my transmission flushed at the dealership and now the torque converter shudders under light load during lockup, around 35-38 mph. With reference to FIGS. (3) There will be no more worries about overheating the transmission in heavy traffic or hot weather pulling a heavy load due to the fluid shear of a poorly designed torque converter. TCC shudder which is caused by the transmission should only occur during the apply or the release of the converter clutch. thanks in advance Ric. How a torque converter works Most of the modern vehicles are equipped with internal combustion engines (ICE). 7 engine with 68,000 miles has developed a shudder/vibration between 45-60 mph. Attainable initial starting torque values range from 40% of normal running load minimum, up to a maximum initial starting torque value that equals the full breakdown torque of the motor. ASTM A193 B7 ASTM A307 ASTM A320 L7 ASTM A325 ASTM A354 BC ASTM A354-BD ASTM A449 ASTM A490 SAE Grade 2 SAE Grade 5 SAE Grade 8. TripleLok torque converter with hand built machined billet parts, not stamped. And he told me that is a terriable solution because it will ruin rubber seals an create larger problems over times. However cyclic load changes in start-up and slow-down of the hydrodynamic torque converter operation have been beyond access to the current flow field calculation methods due to the extensive computer run time and memory requirements in the application of time dependent. Ie going up hills. I doubt the blower motor causes as much of a load as the a/c. more often then not when the vibration occurs it is when I am in 5th and have to slow to around 60 and then slowly speed up under load (up hill or pulling my small boat) and then I get the vibration. The optional new sequential torque converter lockup system delivers unbeatable productivity and fuel efficiency in load & carry and short distance transport applications. when the truck is under a slight load (for example from a dead stop up a slight incline, or from a dead stop when making a sharp turn), and i accelerate very lightly, at about 3 mph i get a real quick, loud vibration. According to my dealer, do the flush and wait 200 miles, if it's still there install a new torque converter (still waiting on mine), if it's still there then a new transmission. The shop has checked the u-joints and other parts of the drive train and think the issue is the drive shaft being out of balance and that this may have been the cause of the bearing failure. I have been wrestling with my '58 Belvedere vibration problem for some time without any success. The problem happens when accelerating with moderate (normal) load. 2003 F-250 Vibration. Once you get to higher MPHs, the trans is in lock up, meaning not using the torque converter. Repair: Broken ring or pinion gear. The number 1 cause of vibration is failure to prepare the crankshaft for installation. I tried to counter that in no way does it make sense that I would be charged $550 if the transmission flush fixed the problem but only $50 if they had to go on to replace the torque. If engine pulldown is normal, torque converter is good: Broken shafts or gears: Drain transmission to determine if large pieces of metal contamination are present: Broken drive shafts: Inspect drive shafts and universal joints for external damage. I have a 2007 Chevy Suburban with approx 45,000 miles. Now it is doing it with the heater on a/c off and in park or foot on brake. 4 and 4R70W, with 226K miles. Maintained very well. $3,000 later…I still have the vibration like originally had in the seat. press firmly on the brake and give it some gas to load up the tranny for a bit? - DucatiKiller Apr 29 '16 at 20:58. The motor current under load is the sum of the no-load current and the current resulting from the load. offers both slip ring and rotary transformer rotating torque sensors. An engine speed related vibration can occur in any gear, including park or neutral, at a set engine RPM. The lock-up torque converter, combined with Komatsu SmartLoader Logic, results in low fuel consumption and high travel speeds in load and carry, and even some V-cycle. Stopped off at a local transmission shop and the tech drove it for a couple miles and said he doesn't think it's the transmission, but more of a mis-firing. It is going to vibrate. One such is Brakes section; this is very important part in every vehicle, though we have most accurate and efficient brakes now-a-days, but they fail at the extreme conditions. Rumbling, vibration problems on W203 Discussion in 'Engine, Drivetrain, Fuel the solenoid which feeds the torque converter lock up clutch Hi for now but I will need to start towing a trailer tent in the summer and I dont know what to do as the gearbox will be under more load/stress I would think. Engine mount is actually a vibration isolate-or, rubber barrier between. Unless otherwise modified, it is not engaged in the manner you suggest. The general thought was that it had to do with the torque converter. Chevrolet Traverse owners have reported 9 problems related to vehicle shudder (under the power train category). Here, you will get a brief idea of what a torque converter is and some of the most common ways to tell if yours is going bad. Additionally, to confirm the responses to the changes of input torque, the amplitude of the steady torque is changed. I checked the bolts connecting the torque converter to the flywheel and they are all tight and the sound seems to go away when you bring it off idle like when its under a load. Discussion in 'The Hokey Ass Message Board' started by cluxford, When under acceleration, there is more load on the driveshaft than when coasting. The problem is that the engine and transmission are vibrating when engine runs under load - for example when transmission upshifts (any gear) or when driving uphill. Usually the P0420 and P0430 are not something that would cause a running condition or vibration. 9L Cummins is designed to handle daily driving and towing duties while delivering improved vehicle response and reliable performance. When worn out, and under a load, the braces are hitting metal to metal, transferring the engine vibration into the frame. Figure 4 shows such a multi-function torque converter. I had a strange problem like that once and it turned out to be a very lose engine mount on the driver's side. bmw forum at Car Dealer Forums; My 02 330, automatic, vibrates when in gear and stopped. Vibration in a driveshaft can be caused by many conditions. nope, don't think that would happen. The torque converter is locking in at too low of an RPM and therefore trasferring the uneven firing of the engine pistons into a vibration that can be felt in the cab. 4 and 4R70W, with 226K miles. This leads me to believe it's not a harmonic. Occurs at steady speed or under slight acceleration. Lockup torque converters were added to many newer-model vehicles to help with fuel economy. A motor’s lifespan can further be extended with the integrated use of condition monitoring technologies such as vibration, ultrasound and thermography. However, vibration problems can happen when these torque converters go bad. An engine speed related vibration can occur in any gear, including park or neutral, at a set engine RPM. Reaction torque sensors are machined from a single piece of rigid material. The transmission never slips, never hunts for a gear and overall runs fine. Under this condition, the converter will produce torque multiplication that is less than what could be achieved under stall conditions. Tapping the brake, releasing the gas pedal or accelerating harder will stop the vibration. Drivers want a Camaro SS A8 recall to fix the issue. I took delivery of a 2016 Sierra Denali (5. R & R of the Engine Control Module is covered under the Toyota Federal Emissions Warranty. 2011 Subaru Outback. Changed the shafts and it went away but still had very slight vibration on take off. This solenoid is part of the control solenoid valve assembly, which is located inside the automatic transmission assembly. offers both slip ring and rotary transformer rotating torque sensors. Took it to my dealer and they diagnosed it as a torque converter issue. The transmission will not hold in OD when there is a load on the drivetrain if the torque converter will not lock. Stops when brake or gas tapped slightly. 5-inch-diameter water-cooled torque converter was used with the 392-cubic-inch engine. Here's what it is doing: from a standing start, under moderate acceleration, with a full load, there is a "shudder" in first gear, then it stops and is replaced by a steady vibration that I can feel in my seat through the rest of the gear changes. I've spent literally days online researching the rumble strip issue, and now trying to find out more about how to best deal with the code. Once the vibration is found, there are six different separate problem categories it can fall into: 1st Order Tire (Freq 11-14 hz at 60 mph) 1st Order Prop Shaft (Freq 38-44 hz at 60 mph). I recently bought an international 4700 with 7. No lights came on during this 3 hour trip and the torque converter was locking and unlocking the entire way. This cam will directly affect the stall in the torque converter by its duration and lobe separation. Ford F-150 - 1997-2003 :: 1999 - Torque Converter Vibrates - Engine Misfiring? I have a '99 F150 w/ the 5. 3TD Auto that has a "can of marbles" type sound at 1600-1800rpm under load. The vibration is present whether in neutral or park. I would say between 2nd and 3rd gear. ) to rear of straight-edge when converter is fully seated. With regard for heating up the fluid, when my van shifts from 4M to 4H driving up a long hill, the atf temp in group 5 will climb about 5C per minute. I've felt a problem much like this in my BMW, and it was a center support bearing. Re: "Rumble Strip" Vibration Sep 30 2014, 5:01pm After reading the first thing that came to mind was Torque Converter, my brothers Focus does this same thing only the convert cost more then his car is worth so he's just driving it into the ground…. I've also had the rumble strip feeling a couple times. I thought it could be a tire but it is very obvious at 1-10 mph so that leads me to believe that is way too slow to get a vibration from an out of balance tire. Typicially this is between about 41-55mph on most trucks, although it depends on gearing. The belt should be straight in the sheaves. He may have the infamous VIG converter. i have a 2004 dodge ram 1500 with automatic and hemi engine. When it happens the tach and speedometer needles both move up and down a little in unison (about 100 RPMS). If vibration or shudder occurs only in 1st or 2nd gear, or when brakesTown Car - Base Only 1995-97 F8VZ-7K177-AA. 42) in November and had to take it into the dealer a week later for a transmission issue (coming to a stop the truck would shudder as. The flex plate has 6 converter holes in a larger bolt circle than the 3 the converter is using (it also has 6 lugs). I've spent literally days online researching the rumble strip issue, and now trying to find out more about how to best deal with the code. Additionally, to confirm the responses to the changes of input torque, the amplitude of the steady torque is changed. The simulation results showed that a slip of 30 rpm or lower would fail to meet the NVH target while a slip of 40 rpm or greater would meet the target. Stops when brake or gas tapped slightly. torque converter family for starting gas turbines. Mine started doing it today under similar circumstances as others; 45-55 mph under load wile going up a long hill. The dealer has been great but their hands are tied. It's vibrating when it's on the verge of lockup (moderate speeds, low rpm and light throttle position. I told the guy I thought it was Torque Converter. When a remarkable load fluctuation occurs, the inverter provides the torque response in the class-top level. it has only 36000 miles on it. load curve engine torque Figure 3: Converter stall torque in relation to the engine torque curve All converters produce large amounts of slip at low speed and under extreme load. Torque converter shudder Model Years Part Number occurs during 3rd or 4th gear under light to Crown Victoria/Grand Marquis - Base Only 1995-97 F8AZ-7K177-AA moderate acceleration. I have a 94 ford explorer. At the same time, torque is limited, load sharing is facilitated and torsional vibrations are dampened. It is a typical project car that has had a few owners helping along the way and the history is unknown. Our testers are available in a wide range of capacities, from 10 oz-in to 25,000 lb-ft, and in multiple measuring units. Picked up truck today. Which i believe is Transmission related. 7 Plot of M, / M, Vibration Tests vs. The vibration will go away for about 30 seconds every once in awhile. No play in driveshaft. The vibration definately seems speed related & only under load. If you press the brake pedal lightly or shift out of overdrive the shudder will quit. $3,000 later…I still have the vibration like originally had in the seat. All 340's up to 72 were internally balanced. 5-inch-diameter water-cooled torque converter was used with the 392-cubic-inch engine. It turned out to he the leaf springs when under big torque would allow the pinion angle to rotate up enough to throw it off and cause a vibration. Vibration when accelerating Discussion in 'LR3' started by rsm, Aug 28, 2006. Vibration while accelerating. It generally occurs at part throttle and light acceleration, between 15 and 50 miles per hour, just before the shift to one of the top gears where the converter reaches "lock-up. I tried to counter that in no way does it make sense that I would be charged $550 if the transmission flush fixed the problem but only $50 if they had to go on to replace the torque. The converter hub is scored or damaged. This warranty is in effect for 60 months or 60,000 miles, whichever occurs first, from the vehicle's in-service date. However, I've noticed that at low speed cruise (55 and below), when the torque converter clutch engages, there is a terrible shudder, basically it feels like driving in a rutted out dirt road. Re: bad vibration when accelerating at highway speeds September 14th, 2015, 4:31 am I'm just spitting into the wind here but that sounds like a torque converter shuddering. A torque converter is the fluid coupling between an engine and transmission that allows the engine to idle at low speed without engaging the transmission. As you can imagine, when I'm pulling a trailer or have a heavy load and I'm driving in a manner that prevents the torque converter from locking up, the temperature will reach 180-210 (this is operating temp when the cooler is fully open. Any ideas??. Hello, I have an issue that has just started with my 2003 Trailblazer Ext 4. It also seems to pulsate when driving on the flat so it seems to only happen when under load. The forces are also torque sensitive, which means the disturbance, will be highest under wide open throttle. Also, chock your wheels and set the parking brake. The vibration starts mild, and can get worse. Unfortunately the OEM Torque Converter is a weak point in an otherwise very reliable Transmission, these Converters have very quickly built a reputation. continually engaging and disengaging). 1998 Chevy K1500 4X4 5. more often then not when the vibration occurs it is when I am in 5th and have to slow to around 60 and then slowly speed up under load (up hill or pulling my small boat) and then I get the vibration. When using a transbrake, stall speed should be selected to be somewhere around 300-400 rpm higher than the peak torque RPM range, since brake-equipped cars tend to drop a few hundred RPM upon release of. My 2004 Sprinter with 230K miles did that noise/vibration at least once a week since it was new. Ie going up hills. Other than that the transmission works fine, I don't notice any slipping. The amount of multiplication will depend upon the actual difference between pump and turbine speed, as well as various other design factors. I'm having the same problem vibration under load over 70 and goes away around 90 mph, I have taken it to the dealer and they couldn't find any issues other than maybe a tire. If the judder returns after updating the vehicle, the torque converter may need to be replaced. So is this a torque converter issue or is the lock/unlock in 4th just a coincidence? Possibly relevant background info: 06 T&C Touring, 3. It is understood that the shuddering/vibration is caused by the torque converter clutch (TCC) solenoid not engaging properly (i. If the concern is gone with the torque converter clutch disabled (Mode B, TCC Open) and is gone when the torque converter clutch enabled (Mode C, TCC Locked), the vibration root cause is TCC shudder and the torque should be replaced. I was lucky. I have a 2018 Chevy Silverado double cab LTZ 5. Took it to my dealer and they diagnosed it as a torque converter issue. If vibration occurs after installation, mark converter to flex plate and rotate the converter one bolt hole at a time. It controls the flux to minimize the fluctuation in the motor speed while suppressing the vibration. It turned out to he the leaf springs when under big torque would allow the pinion angle to rotate up enough to throw it off and cause a vibration. the same issue happened once when the vehicle was at around 45000 miles. The problem is that the engine and transmission are vibrating when engine runs under load - for example when transmission upshifts (any gear) or when driving uphill. Looking to see if anyone has used an aftermarket mechanical temp guage and if they've held up okay as the torque converter temperature gauge for a TD7C. Guess I will race it wed and see what happens. Hi in your post you mention a "noisy torque converter". I recently bought an international 4700 with 7. Torque Converter Clutch. Vech is going into econ mode at that speed (3 cylinders) and the feeling is the torque in between gears (at that speed) Condition is normal. Thrust bearing overloading can be caused by any number of problems, including poor crankshaft surface finish (too rough and/or wavy), excessive "riding" of the clutch pedal, improper clutch release bearing adjustment, excessive torque converter pressure or an improperly mounted front crank-driven accessory (a/c compressor, power steering. Vibration starts really bad at 50mph and decreases as. You could try this with car in neutral first. The unit mounting eliminates misalignment of the torque converter drive belt. Under heavy load (foot well into the throttle) it seems to stay locked up just fine. The stall stage is the initial phase of the torque converter wherein the load is provided with a sufficient amount of power to start and synchronize the speed between the pump and turbine. Replace the torque converter. Took it to my dealer and they diagnosed it as a torque converter issue. 42) in November and had to take it into the dealer a week later for a transmission issue (coming to a stop the truck would shudder as. The vibration goes in and out, like a heart beat, in intensity. Additionally, to confirm the responses to the changes of input torque, the amplitude of the steady torque is changed. It had the torque converter replaced 2X, the motor mounts, the entire transmission replaced, the transmission mount and a few other. Mubashir Hussain, Sami-Ur-Rehman Khan Telecommunication Engineering Dept FEST, Iqra University Main Campus Karachi, PakistanAbstract– This paper serves as a survey on energy harvesting from different sources and their methods presented after a brief literature review of different technical papers available in the public domain. Vehicle Shudder problem of the 2010 Chevrolet Traverse 5. Torque Converter Shudder Repair Procedure (Continued) C. However, vibration problems can happen when these torque converters go bad. I believe torque converter shudder is typically associated with light throttle and the upper gears. Does it stop shuddering after a shift? Accelerate through the 50 mph and see if the shudder going away corresponds to a change in rpm. The causes could be any number of things, including clutch failure, out-of-balance flywheel or flexplate, torque converter, a bent or broken transmission input shaft or a failed transmission input. The whole car rumbled and jerked noticeably on a 100 mile trip from Michigan to Indiana. For these devices, the stall torque is greater than or equal to the maximum output torque for a given input speed. Hello, I have an issue that has just started with my 2003 Trailblazer Ext 4. Transmission/torque Converter Problems The Nitro has been in for the third time to fix the shudder. My VS Berlina S2 Auto 130,000ks has started to vibrate/shudder under load, but only in about the 1,500 to 2,500 RPM range. When you excellerate , especially under a load it is looking to place the engine in the correct mode & until it does that the vibration takes place. The Junker theory is discussed. Driveshaft balance issues can generally be felt at vehicle speeds over 30mi. Precision of New Hampton is the largest privately -held torque converter remanufacturer in the world. 2018 DEUTZ FAHR 5120 Zum Verkauf in Tulsa, Oklahoma Zum Verkauf bei Tractor-House. The torque converter is charged with the job of transferring that power. Signatures:. Thrust bearing overloading can be caused by any number of problems, including poor crankshaft surface finish (too rough and/or wavy), excessive “riding” of the clutch pedal, improper clutch release bearing adjustment, excessive torque converter pressure or an improperly mounted front crank-driven accessory (a/c compressor, power steering. When we refer to a locking torque converter it is the TCC that is performing that function. Possible tranny/ torque converter issue? this one is slightly different from other tacomas ive worked on. The total "pressure" under several bolts will be the sum of the "pressures" under each bolt. Show Full Signature 2015 T250 MR cargo w/windows, 3. Torque Converter Diagnosis. Took it to my dealer and they diagnosed it as a torque converter issue. The torque converter is a wear-free starting device which is adapting itself infinitely variable to the required conditions (road resistance). the vibration seems to be in my seat. Using VFD for speed regulation will obtain a substantial energy saving rate. Torque converters have a one-way clutch that can jam and prevent the. I have been having a vibration from under the truck - finally pinpointed when it happens. I have a 1993 Suburban, 1/2 ton 4WD with the 4L60E transmission. Dual clutch transmission equipped powertrains are similar to conventional automatic powertrains with the exception of no isolation of engine and transmission using the torque converter. not sure what that means but seams to vibrate when ever the rear wheels have a positive load on the transmission. FYI, if you lift your foot off the throttle the torque converter will unlock to allow for coasting. I took it to the tire shop to have it checked and they did come back with an out of balance tire but it didn't fix the problem.

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