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

Cudafever said

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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If you dare to smell thatchit it all smells the same, so................. Ima thinking they might all be, the same. I use the GM stuff, but I don't put it all in, lol.
I set my cone-types up at 120ftlbs turning torque; not breakaway torque, and I do it with a stub-axle in the vise and a stub axle on the T-wrench end that has a big-old nut welded onto the end. At 100 it will slip if both wheels are not on the same surface. At 150 it becomes a spool. I use select-fit Ford side-gear washers to set the preload, in concert with additional springing if necessary.And sometimes,I put some heavier springs in there, but I don't recall what they were out of. I set the clearance at the bottom between the cones and the case to .080 minimum by lathe cutting the cones off. This gets me another 100,000 plus miles out of them.

On the clutch-types, the engine torque runs the cross-pins up the ramps, so until the clutches wear-out, I get what I get. Sometimes put a lil more spring in them

I like them to slip around turns at normal cornering power. I hate it when they act like spools.