rear end on 01 f150 supercrew

has anyone had trouble with the posi-clutch packs going out on the rear ends of these? lmk

Yep. We add a friction modifier from Ford and drive it in circles both ways before we tear the rear end down. Lots of times this fixes the problem.

Yep. We add a friction modifier from Ford and drive it in circles both ways before we tear the rear end down. Lots of times this fixes the problem.
i second that.