Driveline vibration!!! I need help!

Did you take the shaft to a reputable shop? Maybe take it to a different driveline shop. I would have the driveshaft checked for run out, if they added to the shaft and did not do this that might be your problem. On the shaft are there a lot of weights? If so, again they may have tried to compensate for the run out. If the addition to the shaft is not straight, well you see where I'm going with this.

I had my shaft shortened and balanced and it was so true that the weight they put on is very small.


Also have you checked your pinion angle?