Is it possible that a bad tranny mount would cause an odd u joint vibration? When I hit the go pedal, I get a vibration, and when I decelerate, it vibrates also. I replaced the rear joint just recently, and the front joint is still in great shape. I am going to pry on the back of the tranny/transfer case to see if they move on the crossmember, but I am not sure that this is even causing the problem. It is driving me nuts. Any help would be appreciated, thanks.