Vehicle Shudder problems of the 2008 GMC Acadia

During acceleration the vehicle vibrates when going between 35 and 45 mph. Was not able to reproduce issue at dealership last fall, but is now getting much worse. Happens almost everytime the vehicle accelerates.

Transmission started slipping. I would pull out onto a street and it would slip and I almost got his by a car. I took it in repeatedly to dealer and they couldn't duplicate and after repeatedly taking it back and them keeping it for a month they finally replaced the transmission. Repeated steering issues. I took it in constantly and was told nothing wrong but after looking at it myself I found melted bushing and after being told all that had been replaced already. Steering problems from day 1. 4 times of having power steering replaced and steering column and every time I got the vehicle back the vibration was worse, today I found the problem on my own. The rack and pinion has a major leak. Not sure how repeated trips to the dealership and they couldn't see this. My steering also locks up while driving almost hit a car. . And the dealership never has loaners so im stuck driving an unsafe vehicle while I wait because I was told I can only go where I bought my vehicle because of the extended warranty. This vehicle goes in to the shop and as soon as it is picked up it needs to go right back the same day. Worst vehicle and most unsafe of anything I've ever owned.

Tl-the contact owns a 2008 GMC Acadia. The contact stated while driving approximately 40 mph, the vehicle began to shake and decelerated to 10 mph independently. The engine then stalled. Upon restarting, the transmission failed to shift into reverse. The contact was able to resume in operation. The vehicle was taken to an authorized dealer for diagnosis. The technician stated that the transmission wave plate fractured which caused internal damage. The transmission was replaced at the owner's expense. The manufacturer was made aware of the problem. The approximate failure mileage was 70,000. Js.