Thanks TBJ and FatKid

It seems like ball differentials are hyped up to be more maintenance than they really are. The diff in this truck could use a rebuild(its kinda gritty), but was still working fine when i drove it yesterday. I think with a proper rebuild it would be good. I found out the diff was in backwards when i got the truck. So, before i ran it, i inspected it and readjusted it when i reinstalled it in the correct direction. The slipper is set pretty good and slips long before the diff(havent heard the diff slip at all).

Im liking the T4 pretty good so far. I think it'll be a rocket once i get the motor cleaned and geared correctly.