Drivetrain vibration

[QA1_Bill]

No, I highly doubt that you'd be able to see it vibrate if up on jackstands. Your best bet would be to take the driveshaft (complete with U-Joints and slip yoke) to local shop who does driveshaft work and have them check the balance. Before you do that, make sure your pinion angle is correct. It should match the angle of the slip yoke. Tremec has an app for smart phones that can help show you your driveline angles.