HELP!!!!Put in 8 3/4 rear and it vibrates real bad

SGBARRACUDA said

The Precision part number for the conversion u-joint is #347. That was the first thing that came to my mind, u-joint not centered. When i was 16 i had a 65 273 4 speed Dart and I forgot to put the clips on the u-joint and vibrated like you said yours is doing.

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But, in an earlier post he has one wheel that wobbles, he switched the wheels and still has the wobble. Either the new bearing he put in isn't seated properly OR something is bent or possibly both.

I don't know how much strain the driveshaft would have put on the rear after the car was set down with full weight on the rear. If it wasn't shortened it probably went in with the rear suspended and then bound up right good after the weight was put on it. I can only guess right now.

I asked if he had it shortened and haven't heard.