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This is why I have always been a big fan of flushing fluids regularly maybe sooner than others and replacing the diff covers on these trucks with something we can drain.  Sucks that this happened to you but I agree this could have been coming no matter if you had changed the fluids or not but I believe it probably did take what ever “if anything” that was in the bottom of the diff and resuspended it in the new fluids.  Only way to make sure is drain completely and flush then refill.  And that’s no guarantee it wouldn’t have happened but I would guess you probably would have had better odds.  Again sorry you had that happen, especially away from home like that!