Trans shudder

[yoda009]

I'm a diesel tech and I believe my 6l80 is shuddering from 25-45 mph. Going to see if I can watch live data for converter with my diesel laptop this week. I'm concerned about replacing filter and fluid with my truck at 169k. I've also seen you mention it as a band aid. Besides the shudder the tranmission drives very nice. Only when it drops down to about 1100 rpms cruising it seems to start and feel like your driving over road bumps. Opinions? Would changing filter fluid trash it? TIA

 

[j91z28d1]

I'm no automatic transmission guy, but from reading this board with your mileage. the torque converter is trashed it's cluch and with every shutter is dumping trash thru the reat of your tranny.

you can try swapping converter now, but you really should refresh the whole tranny at this point. since you're a mechanic, put it on the rack as soon as possible and get a converter in it. you might catch it in time. but probably not.

 

[Joseph Garcia]

@NickTransmissions is our resident transmission expert, and he will chime in with his thoughts and perspectives.

 

[yoda009]

I'm no automatic transmission guy, but from reading this board with your mileage. the torque converter is trashed it's cluch and with every shutter is dumping trash thru the reat of your tranny.

you can try swapping converter now, but you really should refresh the whole tranny at this point. since you're a mechanic, put it on the rack as soon as possible and get a converter in it. you might catch it in time. but probably not.

We don't have lifts. We have pits cause I work on semis and heavy lol I wish I had a rack at work

 

[j91z28d1]

We don't have lifts. We have pits cause I work on semis and heavy lol I wish I had a rack at work

ahh we have hetra at work but I try not to do anything that takes longer than a few hours on a weekend. so yeah, I'd be at home on my back. I'm getting to old for that stuff haha.

good luck with it.

 

[NickTransmissions]

I'm a diesel tech and I believe my 6l80 is shuddering from 25-45 mph. Going to see if I can watch live data for converter with my diesel laptop this week. I'm concerned about replacing filter and fluid with my truck at 169k. I've also seen you mention it as a band aid. Besides the shudder the tranmission drives very nice. Only when it drops down to about 1100 rpms cruising it seems to start and feel like your driving over road bumps. Opinions? Would changing filter fluid trash it? TIA

What were the results of your test drive with the scanner?

Drop the pan if you havent already - if you see large amts of clutch material, granular metal, sliver or bronze matter yank it for overhaul.

 

[yoda009]

What were the results of your test drive with the scanner?

Drop the pan if you havent already - if you see large amts of clutch material, granular metal, sliver or bronze matter yank it for overhaul.

Picked up a scanner to do more testing and gonna check pan asap. Buddy from gm is telling me same for checking for material and if caught early enough..may get away with just changing the torque converter

 

[NELLY1947]

I'm a diesel tech and I believe my 6l80 is shuddering from 25-45 mph. Going to see if I can watch live data for converter with my diesel laptop this week. I'm concerned about replacing filter and fluid with my truck at 169k. I've also seen you mention it as a band aid. Besides the shudder the tranmission drives very nice. Only when it drops down to about 1100 rpms cruising it seems to start and feel like your driving over road bumps. Opinions? Would changing filter fluid trash it? TIA

This is a true story. Had a problem with my 2019 Yukon xl Denali. At various speeds would get shaking. Even had a trouper pull me over cause he thought I was going to lose a tire. Changed the Michelins 4 times under warranty. 3 wheel alignments, road force balancing all the time, right upper and lower ball joints, left tie rod and both staffs. This was all under 8k in mileage. Finally went to a 3rd dealer where they were on the 3rd hour as the zone told them to tear it apart 1 bolt at a time.
So drumb roll ..... the problem????
A washer between the right front mag and rotor was found...
Appairently when the front end is built nuts and washers are used to keep it all together. and this was left there by error. You could see the markings where it was moved around.
A $0.50 washer caused about 7-8000$ in repairs. I still have the washer