Wife's 2015 Enclave has hd a clunky transmission since about 30k miles. I barely ever drive it. When it was still under warranty the dealer said it was fine (of course). It's got 85k now and still runs fine, but the clunking continues and seems to have gotten worse. Feels like slack in the driveline being taken up when you pull away from a stop, and it shifts a little hard. I don't know anything about torque converter autos- is this as simple as some fresh fluid, or is there something else I should be looking for? It's about to be handed down to my 16yo daughter, I don't want the thing to leave her stranded somewhere.
Really hard to know from not being in the driver's seat, but something doesn't sound kosher. Hydraulics, worn clutches, stuck solenoid, stuck valve in the valve body.... something is out of whack.
Not a fluid/filter fix. Internal. 6T75 is a pretty stout transmission and doesn't shift like honey, but clunking is no bueno.
When does it clunk? When the transmission shifts, when accelerating from a stop, the first time you put it in Drive?
Drivetrain clunks are almost never inside the transmission, it's going to be axle or suspension.
solfly said:
https://static.nhtsa.gov/odi/tsbs/2019/MC-10168212-9999.pdf
This TSB sounds like exactly what we have going on- just slack in the driveline that takes up sometimes when you get on or off the accelerator. If you get on the gas hard from a standing stop it is disconcerting. Sounds like it's just annoying but not dangerous to the car. Thanks!
