Originally Posted by RobV
does it vibrate at 3500 sitting in neutral?
as dean said check for cracking.
jack rear off ground and run the car. make sure one foot is on the brake ready. there is no load on the drivetrain but easier to try then removing and reinstalling tranny and getting the same thing.
Vibrates at 3500 in neutral,in gear, clutch in, clutch out. Nothing really makes a difference.