Well i recently aquired 1990 Gxl that has a s4 jspec swap. one of the problems ive had with it so far, was that the tranny mount was bad, and the drive shaft hit some werid bracket that was around it. Today i fabricated a new soild mount bracket but i have violent vibrations when off throttle...could my driveshaft be out of balance? any ideas?

 

no ideas?