and I take it you had the whole thing checked out..
weird man...all the components you had checked...yet usualy when a vibration takes out rear U joints would be...unbalanced drive shaft...bad u joints to begin with...bad pinion yoke or bearings to same...misalignment/..
if the axles were bad you would be eating gears and seals..
the suspension is all tight?...outside of installing a whole new drivetrain...got me hangin..
