when i build the diffs i used this both this
http://www.team-durango.com/blog/?p=24
and this
http://www.team-durango.com/blog/?p=2584
and from what i can tell i built the diffs correctly.
if i totally tighten the screws i can still spin the diff but its very hard to spin.
EDIT: one more thing my diffs did not come with seals but i see people talking on this forum about stock seals? so should my truck come with seals? but that would not make sense because the instructions never showed any seals when i assembled?