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2nd Gen Ram Tech1994-2001 Rams: This section is for TECHNICAL discussions only, that involve the 1994 through 2001 Rams. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
Could it be vise or channel lock marks from maintenance or manufacturing? Since you didn't find any large pieces of metal in the fluid I would say your good to go.
thanks for all the info guys. By the way the diff moves i figured it was either from a prior failure that had been fixed/reused or that it was done sometime when the diff was out. I've had no issues with the rear but i just needed some piece of mind.