Thanks. I just had the diff out putting a locker in this winter and the bearings had just been replaced (if I read all the receipts that came with the truck right). I think I just nicked the seal because it didn't leak before and now its leaving a puddle in the driveway with only 400 or 500 hundred miles on it. I was kind of worried about the play in the shaft being about half an inch in and out that I didn't seat something right. When I pulled the pass side out the whole assembly came out, and when I replaced in I put the inside shaft in then the CV. Don't know if that would have made a difference or not. There is no vibration or grinding and had a chance to test out the 4 low for a few miles. Think I might try some of the additive because it does ratchet in low but nothing insane. Will know more this weekend.