I would disconnect the return line (top) at the diff cover, fill diff and then run the pump until you see a steady stream of the new fluid. Then reconnect return line and fill to recommended level.
I couldn't find a flush and fill procedure, but this will help with the fill procedure.
Differential Housing Cover.pdf
I couldn't find a flush and fill procedure, but this will help with the fill procedure.
Differential Housing Cover.pdf
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