I've had my best success eliminating driveshaft vibrations by getting the tail shaft of the trans parallel to the pinion yoke of the rear end. This lets both U-joints operate at exactly the same speed. It doesn't really matter which goes up and which goes down, just make sure they are both parallel to each other.
My trans points 3.5* down and I have my pinion pointing 3.5* up and she's smooth as butter...
__________________
Lance
1985 Monte Carlo SS Street Car
|