Vehicle Shudder problems of the 2007 GMC Acadia

Tl-the contact owns a 2007 GMC Acadia. The contact stated that while driving up a hill at approximately 15 mph, the vehicle started shaking without warning. The vehicle was taken to a dealer where it was diagnosed that the 35r wave plate needed to be replaced. The vehicle was not repaired. The manufacturer was not notified of the failure. The failure mileage was 139,000. Ss.

Was driving car and transmission started acting up. Car would shake when shifting gears. Service engine light came on. Took to service garage and said would need to rebuild transmission.

While traveling down the highway with family the check engine light came on and the vehicle began shake and jerk violently. I pulled to the side of the road and the vehicle would not go into reverse and forward made a terrible grinding noise and could not go over 10 miles an hour which is very dangerous driving at dusk. Got the car home and took to the dealer the next morning. We were 2 months past our 100 k 5 year power train warranty and gm would only give a small discount on a transmission rebuild. Not once did they ask about our safety.

While accelerating vehicle started to shake between 30-40 mph. Shaking subsides at around 45 mph. This started around may 2012 with 99,000 miles on the car. Took the car to the dealer to have it checked out because I though it was the transmission. They thought the tires needed to be rotated and balanced, which did not fix the problem. By 106,000 miles it was so bad that the vehicle could not be driven safely. This time the dealership said it was the motor mounts, which did not fix the problem. I had them keep the car until they found the problem. After 2 weeks they determined that it was the transmission! after the transmission was replaced the vehicle drives great. I have read hundreds of complaints on the Acadia transmission and there are likely tens of thousands of cases just like mine. There should be a recall for the transmission on this vehicle.