Finally think I solved my vibration issue

FredS said

you checked and validated the pinion angle? You said you ran it on a hoist, was the rear end drooped?

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I remember my pinion looking like it was "wobbling" when ran on a hoist. I did eventually

get the driveshaft rebalanced and the rebuilder said it was bent a little. The rebuilder was able to straighten it and balance it. He offered to build me a new one though. I don't remember why I didn't get the new one, probably cost at the time.