October 4, 2021 at 1:53 pm #674237
5.3L, 8 spd auto transmission. does not appear to be tire, road related. 52,000 miles.
October 7, 2021 at 10:48 pm #674776
Could be the well-known “Chevy-Shake” that has plagued some recent GM full-size trucks. I don’t know a whole lot about it in great detail, but you can get more info on-line.
October 10, 2021 at 4:30 pm #674948
GM had problems with the low quality oem transmission fluid in the they now recommend using a special Mobil 1 synthetic.
[quote]The base stock of old GM Dexron fluid (19355656) has the ability to attract low levels of moisture, which can cause degradation of the coefficient of friction of the fluid. The new fluid (19417577) has a new GTL (Gas to Liquid) base stock that is able to tolerate more moisture. Shuddering transmissions and torque converters have been recovered with the new fluid. New transmission fluid tests have been developed due this issue to prevent it from occurring with new transmission fluids.”[/quote]
October 13, 2021 at 7:40 pm #675634
You are correct. Thank you for your response. I called the dealership, took it in. In less than 2 hours they flushed the transmission and filled with new fluid. Even out of warranty there was no charge. Now runs like new. I was told that GM is now going back to the 8 speed and dropping the 10 speed due to excessive problems.
October 17, 2021 at 4:36 am #675939
No, they are not dropping the 10 sp nor the 8 sp. for that matter, that’s just naysayers babble. I have the 10sp in my 2021 Sierra Denali Ultimate and its flawless,
2022 Model Transmissions
Transmission, 8-speed automatic
Transmission, 10-speed automatic
GM problems are mostly lubricant related and voodoo emission/fuel economy programming for the most part. The decision as to who actually makes GM factory filled ATF is based on low bid. To meet low big, lubes are often reformulated down to reduce cost and performance to where it just barely meets spec. GM may set a performance spec, bu the bean counters are in charge of acquiring products the meet the specifications, no more no less.
Fwiw, GM now has three (3) Transmission fluids in use;
Dexron VI for all trans up to and including the 6sp
Dexron HP for the 8 sp (High Performance)
Dexron ULV for the 10 sp. (Ultra Low Viscosity)
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