The driveshaft is running up from the transmission to the rear end, right?
If you roll the pinion down, the driveshaft also goes down in the rear, resulting in a lower working angle for both the front and rear u joints.
It's pretty hard to diagnose any vibration through a forum but the driveshaft angles are not good the way they are so it seems like a good place to start.
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Donny
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