Need S-10 expert

[darkmanx]

Since I am new here I hope I am doing this right.
I have a 2003 S-10 Ext Cab 4cyl Automatic. Problem is a vibration in rearend. Dealer has tried to fix it twice. He is working on pinon angle. I am being told that the two piece drive shaft is part of the problem. I ask for a copy of the paper work that came from GM as to the fix. They are going to give me one.

Has anyone else had this problem? If so what was done to fix it? It seems to only be in the Extended Cab.

I need help or a web site that can help me with this problem. This vibration is not good for the drive train.

Thank you, Ron

[02.ZR2]

Try having a driveline shop balance the driveshaft assembly. It may be out-of -balance.