some google foo
discovered common GMT800 front diff issue, there is a little stupid tab behind the driver side front diff output bearing that holds preload. the only thing that holds the tab into the lock nut is the seal press. the tab floats so you cant "peen" it over or lock it any other way.
popped out the cv and seal and with my finger could literally lift the side of the diff (and gear set?) about 1/16" of an inch.
tightened preload nut about 2 turns, seated lock tab, added a few shims and re installed seal after some bench straigthing where my 3 jaw slide puller kissed it a bit.
swapped in stock torsion keys back in to lift the front up a bit as its still rubbing on bumps and with 2 passengers its worse.
gave it a once over, all looks good.
getting loaded on a trailer to deliver to new owner tomorrow.
![Embarrassed :-[](http://bb.m4wdfabrications.com/Smileys/default/embarrassed.gif)