Have an 80 yota. Driveline seems to be fine. Could the Birfields be messed up and causing the vibrations?? The oil seals are bad at the birfield. Sorry don't know what that part of the axle is called?? The lack of oil is a problem, this I know, and speeds up the process of breaking down the birfield. <img src="/forums/images/graemlins/scared.gif" alt="" />Looking for a few places to start looking for the problem.