I need some techs (Woody) to tell me what is wrong here. I did a rear 3rd member swap with a used one, and took out the drive shaft from the slip yoke and did not mark it. But I think It may be a bent flange on the 3rd member. Take a look at this video and see if you tech guys can figure it out. I played with the ujoints and they seem fine to me. Someone metioned I may have the Ujoints not matched with the other one on the other side. Does that make since?