[brushlessboy16]

I spend an hour just now trying to figure this thing out. re assembled the truck as is with my spare diff. Truck acted as if re entire rear driveline was disconnected from the driveline But it was quiet. Then i took the rear apart thinking that the shimmoing on the ring/pinion was too tight- removed two shims and the clicking returned. Then i quit while I was ahead and came inside.

This leads me to beleive that the case on my spare diff is slightly longer then that of the original. so it requires the pinion to be closer to the case. but when moved closer to the case it binds on the outside of the diff housing evident by the wear marks. but any less shim behind the pinion results in a loose mesh and the diff clicking.... I think.

SO. What I plan to do is order all the parts that went bad for the original diff and reinstall it into the truck... That should resolve the problem... I hope.