1999 Pontiac Trans AM Transmission and drivetrain Problems

“Rear differential whining unbearably loud. Took to local GM dealer to diagnose, they say it needs replaced. Warranty I bought is inspecting to see if they are going to pay for it. This affect's the comfort, reliablity, and safety of this car. I will update when more info is recieved from the GM dealer. Upon further investigation online, this is has happened to a lot of other ls1 powered f-body owners with this GM rear differential.”

“While driving at normal highway speeds after vehicle is warmed to normal operating temperature, the vehicle loses power unexpectedly. Motor revs during event, almost as if car is been suddenly shifted into neutral. No engine lights come on, vehicle simply loses forward momentum. Transmission guy says everything is fine, found nothing wrong.”

“I bought my 1999 Pontiac Trans Am brand new, 8/23/99. It now has 31,310 miles and both my door panels have cracks, about 1/4 way back. Also, I had a growling noise in my rear bearings and I had to have a new pinion bearings, carrier bearings, ring and pinion gear set installed. I was told by the technician where I took it to be fixed it looked like it had been driven hard. My car has been driven approx. 10 miles a day everyday since I got it and has been only once, to louisville, about 100 miles away. It has been in the garage every night since I've had it.”