I have had this problem for a while but it seems like it is getting worse. The problem is when i put the car in reverse and when i'm letting the clutch out the whole car shakes really bad. It feels like its coming from the tranny. It also does this in 1st gear when i'm takeing off. Sometimes it also does it when i'm turning a corner in 1st or second gear. Iv'e noticed that it doesn't really do it as much when i first start the car in the morning. It seems like it gets worse the longer i drive the car. Also the longer i drive the car it seems like it gets harder to put the car into Reverse and 1st gear. Usually 1st isn't a problem to get into but reverse is really hard to get into after i drive the car for a while. The problem of the car not wanting to go into reverse or 1st gear just recently started happening though. Any suggestions would be really appreciated. I also already have a Poly Tranny mount and it is not broken.

 

Mine did the exact same thing a while back. It would also vibrate when downshifting, especially into third or second gear.

Then the LT1 Gods looked down upon me, pitied me, and healed the car. Really. I drove it one day, and the problem had gone away.

 

ttt

 

Anybody else?

 

Try posting it in the Drivetrain forum. When I posted over there with the exact same problem, they seemed to think it could be the pilot bearing/bushing that was going out. That doesn't explain why mine went away though.