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Trans shudder, 4L60E

2000 Silverado torque converter shudder.

Trans shudder, 4L60E

Postby Bob Lull [OP] » Sep 27 2011, 1:33pm

Hello All, I am new to this forum and hope you can help me here. I also look fwd to being able to contribute on other issues. so here it is.

Issue surfaced after trans broke and was replaced. Trans replaced, torque converter shudders between 40 and 50 when applying throttle but not enough to down shift. Shop replaced converter 3 different times, went completely back thru trans again, shudder still there. Replaced PCM at dealer after multiple test drives revealed no issues with Tech 2 hooked up, no DTC's, no malfunctions anywhere to be found. Duty cycle during TC lock up and unlock is normal. TPS was replaced but revealed no change. Light application of brake while driving shows converter lock up functions correctly. Lube Guard added, no change. Trans Shop will not do anything further at this point as they are positive it's not the trans. 2 shops I've taken it to, after multiple hrs trying to diagnose it are convinced it is the trans. Do I start throwing parts at it in hopes I can locate the culprit that's commanding the trans to act like this? I have a difficult time accepting this is a coincidence issue that appeared when original trans broke but I have seen weirder stuff before. Truck drove and ran fantastic prior to trans breaking. Tune up parts have approx 30K on them. I use OEM parts only. Please help, I am at point of trading in truck.
Truck is a 2000 Silverado, 2WD, 5.3, 4L60E, stock. My wife says trade it in and get a new Avalanche however, I really like this truck and it's condition is not far off new. Owned it 7 yrs, kept it immaculate.
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Re: Trans shudder, 4L60E

Postby Bob Lull [OP] » Sep 28 2011, 2:00pm

UPDATE....... Plugs and wires replaced, added LubeGuard to trans. Much improvement. Still feel a slight shudder but MUCH improved. Has anyone else encountered this type of issue?
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Re: Trans shudder, 4L60E

Postby masterem88 » Oct 07 2012, 4:06am

obviously im not there to self diagnose this issue, but on the tech 2 you can watch Torque converter slip speed and it cannot exceed 50 rpms. now although sometime even if its under 50 rpms it can still cause a mild shudder. normally its the torque converter lining slipping and or cracked piston in the torque converter, but being how they already replaced it i would pretty much rule that out. if in trans is could still be in the valve body and or tcc pwm solenoid. i would never rule out an engine miss also. it doesnt take much of a engine miss to feel the jerk of it when the converter locks up. which i would also use a tech 2 for, go to misfire counter and history misfires to see this. watch misfire data as this problem occurs to determine an engine miss or trans problem. also like on older vehicle that are unable to watch this data, we add a bottle of motorcraft friction modifier (limited slip additive) to the trans and let run for awhile and test drive a few cycles to ensure it has fully circulated and if tcc shudder gets better or in alot of cases goes away, then you know problem is in trans. this does not permenantly fix problem but is to used to diagnose.
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Re: Trans shudder, 4L60E

Postby camfire87 » Oct 07 2012, 4:37am

Double check your u-joints/driveshaft. Once would generally assume that a driveshaft related shudder would be evident at all times, but it is possible that it only comes up at a certain speed.
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Re: Trans shudder, 4L60E

Postby atblack21 » Oct 16 2012, 10:25pm

DId you ever figure anything out with this? I have the exact same issue. You described it to a T. Mine does it around 45 to 55 MPH. I put in Lubeguard as well and it didnt help mine. I have a 2006 GMC sierra 1500.
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Re: Trans shudder, 4L60E

Postby lonestar245 » Oct 19 2012, 5:28pm

I have a similar problem with a 2007 5.3 4 speed- new body style. It started around 80k- replaced a pump solenoid and it was OK. Started again around 125k. It just seems to bump slightly when under a load in high gear between say 40 and 50 mph. Not enough load to make it downshift, like when going uphill. give it some gas and it downshifts and goes away.

Reading online indicates this is just a weak trans, with several problem areas. Bummer, my '99 Navigator has 230k and never a single trans issue, and I have towed with that thing too.

related: I had a 93 Suburban with 350 and 4 speed auto, and thought I had a converter problem. Took to a very wise trans mechanic and he said it was a runability problem. took to a dealer or indy mechanic (forget which) and they changed the plug wires and it was perfect after that. trans did eventually go out around 130k.
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