RE: Savage Flux Diff Problems
There looks to be some heat bluing on the gears and pins. They could be overheating and getting brittle. Lack of lubrication could cause this, as well as extended "one wheel peel". Basically allowing one wheel to spin very quickly while the other either doesn't spin, or spins very little. This causes the internal gears to spin very quickly, which can over heat them (particularly if the diff isn't filled with fluid).
If something is too tight, or out of alignment it could be causing excess friction and heat.