Thanks guys. One guy at my LHS said that maybe the grease I'm using in the diff is to slippery wich is making the diff balls slide on the plates and not turn? He said maybe thats why I have to have the diff so tight so that the pulley won't turn. I'm using a Synthetic automotive grease. I'm going to order the Super Grease this week and will wait to rebuild my diffs and Centax thrust till I get it!