Drained the fluid from the final drive project today as well as oil change and transmission oil change. Looked as though they were original fluids. Never seen oil so black as what came out of the engine sump. Back to the original point...the final drive drain plug was caked in crud. Didn't appear to be metallic. Just.....sludge? Anyway, heres a couple of pics. Does this look good to lube up and reinstall? I appreciate your advice!!!