new u-joints. The 9" rear is a brand new unit from currie ent, so I don't think that is it.

I did notice the transmission stabalize bushing & bolt was not tight. You know the where it is bolted on the drivers side through the belly pan. Do you think that not being bolted down securely could cause this? I have new parts & bushings I was going to install, just haven't gotten around to it yet.