Hard 2 to 3 upshifts during off throttle after acceleration. Very violent bang during full throttle acceleration. Reprogrammed a computer. Still upshift with a more gentle jolt during cruising throttle uplifts.
Noticed oil on tranny when I did my own oil change. Took to dealer and was informed the torque converter seal needed to be replaced. 6-8 hour job, and all covered by warranty. Dealer said common to first runs of Terrain and Acadia
Leaking oil and shifting funny. Replaced the torque convertor.
Transmission was stuck in 5th gear. Mechanics at the dealership disassembled the transmission and discovered torn 1234 clutch piston seal and scored housing. The piston and housing were replaced.
slipping trans also
Unable to manually shift. Wire has been "cut" somewhere in the shifting equipment. Paid $240 to find out it was going to cost $900 to fix it. Part "not covered" even though it affects manual shifting.
Replaced leaking axle seal
Transmission slips between 2nd and 3rd gear when drving in stop and go traffic under 20-mph. I was able to duplicate this concern for the dealership, but they are unable to fix.
Complete removal of broken transmission and installation of new transmission to include 4-wheel alignment. The transmission would not allow the vehicle to shift higher than 2nd gear.