Alright so I sent my driveshaft in for a rebuild the other day. It's a two piece driveshaft. Was rebuilt front to back new ujoints and steady bearing. I put it back in the truck lastnight and there is now a grinding noise coming from somewhere. It varies depending on the speed. It's really bad when I left off the gas. but if I hold a steady acceleration I cant feel/hear anything. Any help would be appreciated. The diff was warm/hot after a 15 minute drive.