I just did the u joints in my truck and van. I kept hearing clunking. I was checking them in gear and didn't see any play. Someone on here suggested checking them in neutral. Thats when I could see the play. I guess in gear theres pressure on them and they won't move either way.

When I changed them 4 cups out of 8 didn't have any needle bearings left in my van. 1 out of 12 didn't have any left in my truck. Narrowly avoided disaster there. Even if they don't have play in them I'd do them anyway. It was my first time doing them and it was about as easy as it gets.