Rumbling of transmission. clucky start. gm dealer acknowledges the problem and has tried to repair vehicle. gm says at this time the truck 8 speed transmissions are not fixable.
Transmission clunks feels like your hit in the rear end. i thought i was rear ended 3 times so far. my transmission surges forward from 4th to 5th gear. very dangerous to wear i don't want to drive the truck.
The automatic transmission shifts aggressively the first gears from a cold started engine after engaging from park to drive. sluggish shifting and acceleration.
Transmission jerks from 4th to 5th. sometimes feels like someone hit you in the rear ended.