Metal in my 8-3/4 housing. Know what this is??

That's the question. It was working just fine I put a torque wrench on both axle and they held to 150 foot pound(didn't want to torque my lug nut any tighter than that.

Looking on doctor diff sight. They recommend the motorcraft limited slip additive. So that's what i will use. Have Always used the MP additive.

Slip and grip of the clutch pack is what i think would cause it.
Maybe a different additive while work better.

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