Im in the process now of changing my trans mount back to stock from the Poly mount from SPOHN and rotation the torque converter one bolt over and also changing from an LS1 shaft to a LE1 shaft. Im getting serious vibration and the only things changed down there was the mount and torque converter. Ive had the had the LS! shaft in but I can wiggle it a little on the end that goes into the tranny. SO im gonna change it back over to the LE1 shaft and see.

What else could cause vibration? I hoping its not the TC out of balance....its brand new but I know thing happen..