Torque Converter Vibration Under Load

There is a Transmission Enhancement programming fix for this concern part No. No engine light, but when my truck is in between 40-50 at low rpm's "1500" or less it shudders and the rpm gauge jumps up just a lil and back but when I get it to 60 or faster it stops. Most of the time it is a stuck Torque Converter Clutch (TCC) solenoid, but this is not the only cause of this problem. Jump to Latest Follow 1 - 20 of 26 Posts It had the torque converter replaced 2X, the motor mounts, the entire transmission replaced. com and buy online now. You will feel it the most when the car is accelerating just slightly, because the rpm changes slowly. Torque converter bearing? 700R4 with 9. Torsional vibration is often a concern in power transmission systems using rotating shafts or couplings where it can cause failures if not controlled. Sonnax Torque Converter ournal ov 04 1 Torque vibration and harshness), while still providing high- 140 psi under load. that is exactly what the industry has dictated to us for years. During right turns, more prevalent around 40-55 mph if it is under load or gas pedal is being held or increased, left front will chatter. My complaint is I have a 2007 Ridgeline rts w/83000 mi, orig owner. 75" is the small one and 11. The two red areas indicate a too high or too low gear selec­ tion for the load. I had a strange problem like that once and it turned out to be a very lose engine mount on the driver's side. Hopefully your vibration can be pin pointed to the front or. 55 axle ratio can cause a Surge/vibration to start at approx 45 mph (77 kph) when the torque converter engages ( torque converter clutch MUST be engaged ) and then goes away at approx 62 mph (100 kph). I also have a thrumming sound around 1500rpm, but it's not a vibration, and it happens both coasting and under load. Torsional vibration is angular vibration of an object—commonly a shaft along its axis of rotation. The vibration always started just before the shift point and got worse as RPM increased. 99 times out of 100 it doesn't happen at all. Then the vibration came back. vibration amplitudes generated by the clutch damper behavior and the torque converter slip. Torque converter shudder fells like a slight to heavy vibration in the transmission, and is usually accompanied by an interruption in power transfer. The higher number of planets in a gear system will increase the load ability and enhance torque density. A vibration or shudder may be noted on acceleration. The truth is the vibration issue goes all the way back to 2005 (maybe farther) when Toyota issued a Technical Service Bulletin to address the issue. American Honda investigated the judder and found that the torque converter was not causing the judder; rather, it was caused by deteriorated transmission fluid. The diagram at left is a simple one from a 3-speed automatic from the ’60s. What a Pandora's box this has lead to. If it is just a low rpm vibration under load and not all the time, I would think a celtane booster will help like power service. 9L Cummins with the BD-Power 1071260 Hi5 23-Spline High Stall Torque Converter. The first tech said it needed a torque converter but they were waiting on an improved version to come out in about a month. Because all rotational motions have an axis of rotation, a torque must be defined about a rotational axis. That was a month ago. From: Brian Roth <74763. This force creates a torque on the lug nut, which tends to turn the lug nut. We must either shorten the length of the lever arm,. 9 (9 speed transmission) 7 new oil Shell ATF134 (8,5qts). Use a bottle of STP (black bottle only) fuel injector cleaner to 3/4 tank of fuel every 3rd tank, and that should make the engine a lot happier. - - - Updated - - - Could a faulty torque converter cause a vibration under heavy load? If you spin the drive train in any gear with the rear wheels in the air, there is no vibration. Torque Converter Problems. The last piece of info makes me think there is some sort of blockage or restriction in the engine or exhaust system somewhere. The torque converter could be the least understood part of the drivetrain — small wonder it’s so often ignored. Goes away when I take foot off of the accelerator. The Hydraulic system is a complex maze of passages and tubes that sends transmission fluid under pressure to all parts of the transmission and torque converter. Since I got it back the shudder is fixed however now I have the issue with vibration under high engine load. Random — The vibration/noise comes and goes with no obvious connection to engine rpm, vehicle speed or driving conditions. We upgrade Ford's C4 automatic transmission, one of the most reliable transmissions Ford has ever produced. There isnt anyway to tell what fluid is in it. International Journal of Engineering Research & Science (IJOER) ISSN: [2395-6992] [Vol-2, Issue-4 April- 2016] Hydrodynamic torque converter operating under dynamic load P A De La Fuente Bastida1. Noisy in any gear, but not park or neutral. The variable pitch "torque sensitive" pulley mounted on a jackshaft and in-line with the driver. The engine and drivetrain must be ruled out before troubleshooting transmission noise or vibration. Anyone else have it where it feels like the car has what seems like a stumble/misfire/vibration at low speed/takeoff under load? torque converter it is the TCC. Figure 4 - So called preload decay charts are used to indicate the resistance of a particular type of fastener to self-loosening. Have you had the torque converter replaced The vibration & shudder is the torque convertor going into lock up. Engine Dynamics and Torsion Vibration Reduction. The diagram at left is a simple one from a 3-speed automatic from the ’60s. It sits in between the engine and transmission. Torque converter shudder and diagnosis Many people describe this feeling as running over a rough spot in the road. If not, I'll start with that engine mount. From this, we can calculate the torque exerted by the mass (a torque which our gearmotor must be able to exceed in order to lift the mass). There isnt anyway to tell what fluid is in it. By Tom Torbjornsen. If pushed to mid-accel, the vibration is very pronounced and feels like a tailshaft bearing or trans mount (both of which appear to be fine on mine). If you put the auto trans in reverse under load (backing up a hill or even sitting still holding foot on brake while applying throttle in reverse) it makes a sound similar to fan blades hitting metalthe sound seems to be coming from the torque converter/flex plate area. The dealer looked at it this week, and claims they can’t reproduce the problem. I never mentioned it to Anth when he serviced it because I didn't think much of it, however when on the hoist he advised my left front drive/cv axle was buggered as it was clunking when the tyre rotated by hand. They include hardened washers and 12-point heads that are only 7/16-inch in head size compared to the same 9/16-inch head on a standard bolt. Causes for excessive torque converter pressure: There are two main causes for excessive torque converter pressure: restrictions in the cooler circuit and modifications or malfunctions that result in high line pressure. The level of vibration is high and it can be felt all over the car. The rubber in both of these assemblies can be weak enough to cause the vibration, but can still appear OK visually. First post here, I thought I'd give it a shot to figure out my situation. The energy dissipated within the torque converter is minimized to enhance the fuel efficiency. What you have is a slipping torque converter clutch. This motion cancels the friction grip and originates an off torque which is proportional to the thread pitch and to the preload. Advertised stall speed ratings are published simply as a general guideline to help in the selection of the correct torque converter for a customer's application. Tapping the brake, releasing the gas pedal or accelerating harder will stop the vibration. TSB S307-12 This Technical Bulletin has been issued to address customer complaints of an automatic transmission driveline clonk/knocking when changing gear from reverse to drive, fifth to fourth or second to first. Since that is not the case, a broken part would cause other symptoms besides just a vibration, so you have to look for things that does not apply to. If it does not do it when the car is rolling, just when you hit the gas, then its probly not drivetrain. The torque, specified with regard to the axis of rotation, is equal to the magnitude of the component of the force vector lying in the plane perpendicular to the axis, multiplied by the shortest distance between the axis and the direction of the force component. Of course, the leak could be somewhere else, so check for a fluid leak before replacing the torque converter. After I noticed the buzzing noise I noticed today that under low / very slight throttle between 45 mph - 60 mph there is a deep rumble noise and vibration in the chassis. 28 if that's the next question in mind. The planetary gear is designed as a superimposing gear. Also replacing both lower control arms and passenger side inner tie rod end this week. It is barely gripping, and cannot engage under load, but once the load decreases it can engage. Called transmission man back and he said the converter may be out of balance. If guns kill people, then pencils misspell words, cars make people drive drunk, and spoons make you fat. A torque converter. Stops when brake or gas tapped slightly. So as load changes the TC could unlock at anytime between 40-75 (as speed increases load will need to increase). The vibration felt is known as "lockup shudder" and may occur due to a bad engine or transmission as well. Torque converter elements. Wouldn't a bad torque converter cause the fluid to deteriorate, the rpms to rise and be worse under heavy vs light load when there is more power being transfered to the TC? Thanks!. Only happens when accelerating lightly under load. 7 days in shop. Instantly Convert Inch-pounds Force (in lbf) to Newton Meters (N·m) and Many More Torque Conversions Online. For example, torque converters lock up at highway speed for better fuel mileage. Called transmission man back and he said the converter may be out of balance. • checks and sets lock-up valve. Knocking noise from motor when under load, when I unbolt the torque converter from the flywheel I can't get it to make the noise, when car is cold there is no noise. You use torque every day without realizing it. I also borrowed a data acquisition system and a couple of accelerometers - one for the engine and one for the exhaust to see where the vibration originates and what the natural frequency is. They do acknowledge there is a definite vibration however. Under this condition, the transmission is directly driven by the engine. For your problem, it would be obvious if the problem developed right after a part was replaced. An engine speed related vibration can occur in any gear, including park or neutral, at a set engine RPM. I used > the. Finish tightening the lugs down with an accurate torque wrench. If i let my foot of the gas or hammer down its smooth. During right turns, more prevalent around 40-55 mph if it is under load or gas pedal is being held or increased, left front will chatter. They recently expanded the TSB for all 2005-2013 models with a drive line vibration. If there's no vibration, I'll look into replacing that bearing. If you need assistance in choosing a torque sensor to meet the requirements of a specific application, contact us via Live Chat!. 4 Install brand new genuine torque converter solenoid 5 Filter, gasket, and connector. Also, see repair breakdown by problem area and cost. If the vibration stops, with the torque converter disconnected, the problem is found. vibration amplitudes generated by the clutch damper behavior and the torque converter slip. Use a bottle of STP (black bottle only) fuel injector cleaner to 3/4 tank of fuel every 3rd tank, and that should make the engine a lot happier. 5" 2800 stall converter. Over the mid-speed range, the TCC is partially engaged and both the wet friction clutch and the fluid torque converter transmits torque 2-3]. Ha ha, On my C4 I managed to bolt my flywheel/torque converter wrong. Torque converters and transmission can be the source of several types of problems that can result in transmission damage or failure. Vibration under load Under load (the more torque, the more shake), the front vibrates. With the torque converter unlocked, change points -except for the change to 5th gear- are generally too high in the rev range to take advantage of the twin-turbo diesel engine's flat torque curve. A judder from the torque converter lock-up clutch may be felt while driving between 20 and 60mph. Conductor plate was just cleaned. I say normal because my 95k mile 2004 pilot vibrated under light load and low rpm the entire time I owned it (from new for 7 years. Each solution is customized to the exact characteristics of each driven machine within your application. MAIN GRIPE = at cruising speed on freeway or secondary road, under light throttle, notice the tach CONSTANTLY varying ~100 RPM, like the torque converter is locking and unlocking. Starts making noise when. If the vibration stops, with the torque converter disconnected, the problem is found. accelerating for a hill or overtaking). Motor torque, load torque and selection of motors 2/45 Performance In such motors the pull-out torque is normally less than the starting torque. If you take all three torque converter bolts out and rotate the converter one bolt hole and then re-bolt the torque converter back up it changes the position of the weight and sometimes makes the vibration go away or could make it worse. I also have oil leaking around the starter after running it a while. Who is correct?. When i picked up my f150, 2004 truck, i noticed a bad vibration. monitoring the temp under minor load to. There are several things that can cause an engine to shake. More accurately if I keep the rpm's down to normal driving you never know there is an issue. At times it will get the column shifter bouncing around. If vibration or shudder occurs only in 1st or 2nd gear, or when brakesTown Car - Base Only 1995-97 F8VZ-7K177-AA. But the Colorado’s biggest leap forward is the new centrifugal pendulum torque converter in front of the six-speed auto. The converter does "swell" and then return to original shape. I also have a lot of vibes from 3000 rpms and up, but even under no load in neutral. The vibration can be felt in the front seats, in the door and very slightly in the steering wheel. The weights on the outside of it look to be missing. Our predictions compare well with prior measurements on a passive vibration absorber experiment. Just wondering about a stuck torque converter? Are you saying it will die when you stop? Wow that is odd. You will feel it the most when the car is accelerating just slightly, because the rpm changes slowly. If the same torque is applied as before lubrication, a lot more torque will be trans-formed into clamping force. Replaced driveshaft with a Tom Wood custom. I am the proud new owner of a 2005 Liberty CRD. Seems to be pronounced when I'm accelerating and/or when the engine/transmission is under higher stress or "torque. They have had a number of complaints about this from what I have been told. For example, torque converters lock up at highway speed for better fuel mileage. He found that 3 motor mounts were busted. Average failure mileage is 7,950 miles. This is most common after engine or transmission repair or after a collision. I'm told if everything goes well I can pick it up Monday at closing, but more likely Tuesday afternoon. The transmission fluid deteriorates quicker than expected when it is exposed to intermittent high heat loads under specific driving. My trans is officially toast. Both torque converters are matched to each other and alter-nate as the control unit. Torque converters consist of 4 major components that we need to concern ourselves with for the purpose of explanation. Under harsh acceleration the whole engine/transaxle assembly will be torqued in the direction of the engine's rotation. In automatic, it only occurs at 60 mph or over when you accelerate moderatelyand if you keep it accelerating moderately, it keeps vibrating. Now, imagine the electric motor drives a mini** torque converter. I do not think its the transmission or torque converter causing this issue. Seems to be pronounced when I'm accelerating and/or when the engine/transmission is under higher stress or "torque. Bill Eccles PhD Computer continuously records the bolt preload Junker Vibration Test Machine Test Fastener Analogue to Digital Convertor Load cell within the machine measures the Mov em nt bolt preload. OP has everything else remained the same since rear seal replacement??. And the torque converter is what is going to experience the load. 5" 2800 stall converter. A torque converter shudder is a brief shake or shudder in the vehicle when internal clutches apply inside the torque converter. I was very close to trading my 2016 GMC Yukon Denali due to the extreme shaking and vibration coming from the tranny/rear area of the truck. now i have installed a built 1974 302 with a 28 oz. When i let. This fastener bolt torque calculator will Estimate the unknown torque, diameter, axial force applied and coefficient of turning friction for the given conditions. The whole car rumbled and jerked noticeably on a 100 mile trip from Michigan to Indiana. Plug gap is at. I was lucky. Prevailing torque fasteners are of two primary kinds - the deflected. That problem changed from slipping to a vibration or a shutter under load at 45 mph to 75 mph. Awesome! Problems After Borg Warner Solenoid Installed - Common Issue 42RE / 44RE / 46RE / 47RE / 48RE - Duration: 5:16. I could make the vibration go away by putting my foot under the brake pedal and pulling up on it releasing the pressure on the switch. Steering wheel vibration can be caused by a few different issues or components. The ring gear and torque converter looked good when I had it apart. 5" 2800 stall converter. under the supervision of Arne Andersson. 4 w/ auto, has developed a vibration under acceleration pretty much at any rpm. 355 Nm - torque converter; Electric Motor - Power vs. A shudder or vibration may develop while driving at speeds between 35 and 40 MPH. Hopefully your vibration can be pin pointed to the front or. Changed the shafts and it went away but still had very slight vibration on take off. I think we have my bros vibration issue narrowed down to the torque converter. droan at 300Kms under light load in the 1400. It’s OK to admit you don’t fully understand what a torque converter does or how it works. 6 Was instilled used low mile torque converter from 2009 mercedes ML63 AMG with 722. More to come about these amazing converters. They have had a number of complaints about this from what I have been told. Using a stack of hardware store stamped washers can prevent your torque converter from rotating true to your engine and torque converter. We upgrade Ford's C4 automatic transmission, one of the most reliable transmissions Ford has ever produced. I have a TH350 in my 85 GMC that has a vibration under load in 3rd gear. Buy TORCO E4OD 4R100 Stock Torque Converter 4 Studs 4. Its only at the beginning of the revs then smooths out. This vibration typically occurs when the vehicle is hot between 35 and 45 MPH, and goes away immediately if I let off the throttle. This is most common after engine or transmission repair or after a collision. if it is a gas engine,it sounds like its misfiring under load. He knew I wasn't happy and a little concerned. The transmission fluid deteriorates quicker than expected when it is exposed to intermittent high heat loads under specific driving. Seems to be pronounced when I'm accelerating and/or when the engine/transmission is under higher stress or "torque. Would like to invite for opinions on whether torque converter upgrade is a must or just a bonus, and where to order for performance/racing torque converters. If you put the auto trans in reverse under load (backing up a hill or even sitting still holding foot on brake while applying throttle in reverse) it makes a sound similar to fan blades hitting metalthe sound seems to be coming from the torque converter/flex plate area. Torque converter shudder in 4th while lockup is engaged; problem goes away when the brake pedal is pressed slightly to unlock converter. One of the fundamental differences between a fluid clutch (a fluid coupling or torque converter) and a mechanical plate clutch is slippage. The two red areas indicate a too high or too low gear selec­ tion for the load. American Honda investigated the judder and found that the torque converter was not causing the judder; rather, it was caused by deteriorated transmission fluid. As far as your truck is concerned, it can be tough to track down a vibration, as there are many components that can cause them. Since that is not the case, a broken part would cause other symptoms besides just a vibration, so you have to look for things that does not apply to. At 80mph, it's smooth as butter. under the torque-angle curve is proportional to the energy required to tighten the fastener. If the vibration stops, with the torque converter disconnected, the problem is found. Torque Converter Problems. I wouldn't say the vibration is violent but you can feel it through the seats and body of the car, don't really feel anything in the steering or handling. A better way to say it might be: the total load under several bolts will be the sum of the tensions under each bolt. They ended up replacing the torque converter. More accurately if I keep the rpm's down to normal driving you never know there is an issue. vibration/shudder on acceleration. The Combustion Engine (device name "combustionEngine") is our engine model which represents all types of internal combustion engines. The first tech said it needed a torque converter but they were waiting on an improved version to come out in about a month. What do you think? Torque converter bearing? 700R4 with 9. BACKGROUND. I am the proud new owner of a 2005 Liberty CRD. typically diagnosed as a bad torque converter. From the right counter-clockwise, you can see the cover (which bolts to the flexplate), the impeller pump (which slides over the transmission input shaft) the turbine, and the stator. If torque is in lbf•ft and rotational speed in revolutions per minute, the above equation gives power in ft•lbf/min. One of the fundamental differences between a fluid clutch (a fluid coupling or torque converter) and a mechanical plate clutch is slippage. When worn out, and under a load, the braces are hitting metal to metal, transferring the engine vibration into the frame. Is there a brief shudder intermittently present while driving under a light load between 25 – 50 mph? Typically, the condition will be most noticeable prior to an upshift. I have a vibration at 1000-1500 rpm, 30-45 mph that happens under low load and when it happens the rpms dip a couple hundred. The efficiency of an automobile engine is highest when the load on the engine is high and the throttle is nearly wide open. Singh, Super-harmonics in a torsional system with dry friction path subject to harmonic excitation under a mean torque, Journal of Sound and Vibration 285 (4+5) (2005) 803-834, this issue; doi:10. Guess I will race it wed and see what happens. The problem is typically diagnosed as a bad torque converter. It’s OK to admit you don’t fully understand what a torque converter does or how it works. 5" 2800 stall converter. I told the tech about vibration and results of shaft swap and he said it was my torque converter slipping due to dirty fluid. this happens at any speed, always at the same point in the rev band, except when in neutral. If there's no vibration, I'll look into replacing that bearing. In addition to the form above, you can reach us during our office hours of 7:00am – 6:00pm CST Monday through Friday, at 262-252-4301. The problem is typically diagnosed as a bad torque converter. 8 Just in case drive line carrier bearing What i have Vibrations completely GONE!!!. It doe not occur while towing or under load or while manually holding the gear down or TOW / HAUL mode. When the plate is engaged, there is no slippage between the engine and transmission, and the torque converter acts like a solid member in the driveline. Hi5 Torque Converters are serviceable by the end user between passes, or events. I have 3600 miles on it and about 1000 miles ago I notice a vibration in the steering wheel. All under warranty; now at 57200!. A better method is to load the motor down so that it is running at about one-half the no load speed and measure the load torque and the speed. Singh, Super-harmonics in a torsional system with dry friction path subject to harmonic excitation under a mean torque, Journal of Sound and Vibration 285 (4+5) (2005) 803-834, this issue; doi:10. So just as the engine goes to 2000 RPM and a little beyond, the vibration is significantly more pronounced. Of course, the leak could be somewhere else, so check for a fluid leak before replacing the torque converter. The motor starts under minimal load (good for minimizing current spikes) and accelerates the fluid using the impeller. After reading, you will know how a torque converter works, symptoms of a bad torque converter, and its average replacement cost. No steering wheel or transmission lever vibration, but vibration seems to come from body and floor area. Some engine misses only show up or get worse under load and it doesn't get any more loaded than 3rd or 4th gear with converter locked up. The condition is most noticeable when the vehicle is under a. All under warranty; now at 57200!. In physics and mechanics, torque is rotational force, or the force necessary to cause an object to rotate around an axis. Some describe this as the "shudder" not really a shudder on mine, as low throttle I guess. 75" is the small one and 11. Explore videos, white papers, articles, and case studies to find valuable ideas you can apply to your operations. In this article we are going to talk about the part of the automatic transmission called the torque converter. Thanks, Mark. A tach is the best tool to distinguish converter slip/shudder from engine miss. a constant load torque at all speeds. What you have is a slipping torque converter clutch. He replaced and at the same time, replaced the timing belt and water pump. under a Harmonically Varying Normal Load. A torque converter shudder is a brief shake or shudder in the vehicle when internal clutches apply inside the torque converter. Now, leave it in that gear, and let the rpms get back into that range, and it starts again. I have had a vibration under acceleration since I got the car 7 years ago (with only 70000kms). vibration or a > > shutter under load at 45 mph to 75 mph. In modern day converters this theoretical ratio is anywhere between 2:1 and 3:1. Tagged as: Application, Get Curious. first scan and fix whats in front of your face. Thanks, Mark. If vibration or shudder occurs only in 1st or 2nd gear, or when brakesTown Car - Base Only 1995-97 F8VZ-7K177-AA. The only torque converter shudder I've ever experienced has always been on takeoff when you first start to apply throttle. Lets hope this is the fix as it is very annoying. It sits in between the engine and transmission. I was lucky. They know things are. Find the appropriate interaxle driveline series for SPL using the Driveline Sizing graph. The vibration felt is known as "lockup shudder" and may occur due to a bad engine or transmission as well. 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. It’s OK to admit you don’t fully understand what a torque converter does or how it works. However, vibration problems can happen when these torque converters go bad. Parts Information Part Number Description QTY 24279497 Torque Converter: 6. The dealer looked at it this week, and claims they can’t reproduce the problem. Explore videos, white papers, articles, and case studies to find valuable ideas you can apply to your operations. Eureka! There is a known issue with some 06 Civic models concerning a resonance/vibration at 1,500 rpm, between 29 and 40mph. A fluid coupling cannot develop output torque when the input and output angular velocities are identical. Buy TORCO 4L60E 4L65E 300mm 1998-up 2200 - 2500 high stall Torque Converter TMBX TLBX VJCX: Transmissions & Parts - Amazon. Vibration > > continued. 2012-14 Honda CR-V Vibration Issue. must be under moderate to high load; Reverse, 1st, 2nd, and 3rd gear (locked or unlocked) are fine. Torque converter shudder fells like a slight to heavy vibration in the transmission, and is usually accompanied by an interruption in power transfer. Torque-converter automatics have the clear advantage of big torque at low revs. At 1500 rpm and 38-40 mph the torque converter in the transfer case was vibrating, causing the heat shield to growl because of the transfer of vibrations. It takes place of mechanical clutch in an automatic transmission. Vibration > > continued. I've also had the rumble strip feeling a couple times. The statement of being "more under load" would lead me to think trans or maybe the torque converter. Start the. In this article we are going to talk about the part of the automatic transmission called the torque converter. I feel you need to address that issue first. Forced balanced them to no solution. There are several things that can cause an engine to shake. It shakes the steering wheel and causes a nasty vibration of the plastic shroud around the steering column. Hansford Sensors Ltd does not warrant the accuracy of any data contained within the calculator, neither can the company, its employees or suppliers be held liable for the interpretation, use or application of any data obtained from this calculator. If i nail the gas from a stop, vibration comes on as i hit 35-40, than worsens til 60, but i didnt go any faster, very scary. I plan on. If you own a 2012-2014 Toyota Camry that shudders under light acceleration, you may be eligible for both repair under a limited service repair campaign (LSC E03) in addition to an extended warranty offered by Toyota that may get you a new torque converter (CSP ZE5). At 1500 rpm and 38-40 mph the torque converter in the transfer case was vibrating, causing the heat shield to growl because of the transfer of vibrations. Acknowledgment This research was supported by the DaimlerChrysler Challenge Fund. Reduce the throttle to slightly open and the rumble / vibration comes back. Called transmission man back and he said the converter may be out of balance. This means the engine revs far higher than it needs to, generating additional wear and consuming more fuel than required. The torque converter is tested for leaks, lockup, concentricity, and balance to eliminate the possibility of front seal leaks, premature bushing wear, and vibration; Power Torque Remanufactured Transmissions are cold, hot, load, and road tested using custom-programmed dynamometers and Computer Aided Road Simulation testing program, fully. I've also had the rumble strip feeling a couple times. I seriously doubt the converter is ballooning. But it only happens quite occasionally, like maybe once or twice in a 20 mile trip and only for a second or two each time. It will do it at any speed, any gear under constant throttle or light acceleration. Torque Converter Clutch. • 17-040, Vibration While Driving Under Light AccelerationAfter Software Update. RE: Vibration / Shudder IP: Logged Message: Bad news, After replacing the fluid, it was smooth for about 200 miles. So as load changes the TC could unlock at anytime between 40-75 (as speed increases load will need to increase). The 4K vibration isn't horrible in neutral but is very significant under load. Install a rebuildable torque converter in your 1994-2007 Dodge 5. coasting and deceleration it indicates driveshaft oscillation because there's either no load on. OP has everything else remained the same since rear seal replacement??. Our predictions compare well with prior measurements on a passive vibration absorber experiment.