The General Motors 8L family of transmissions has been in service since 2014, gradually replacing older 6L six-speed units across much of the company's lineup. The bigger 8L90 was the first GM 8-speed ...
I am experiencing the same shifting problems and hesitation on my 2021 GMC Sierra AT4 6.2L. It hesitates very bad when accelerating from a dead stop. I have taken it to the dealership multiple times ...
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