Strange noise from rear differential

I started hearing a strange noise from my rear differential today.
I put it on jack stands, drained the oil, replaced with Lucas synthetic

$30 75W-90 Synthetic Gear Lube - 1 Quart (Pack of 2)

75W-90.

Drain plug...

Then I placed it in gear and ran it up to 40MPH and this is what I'm hearing.

https://youtube.com/shorts/p0FwZmQHq7g?feature=share

 

Sounds like the pinion bearing. With that much shaving, take it out and inspect. You should be able to see where the shaving came from.

 

I can't see or feel anything that is bad.
No chunks in bottom of differential housing.

 

You won't find chunk, just a bunch of shaving

 

kind of tough to tell from the picture but it looks like the driven side of the ring gear wipe pattern is the full length/width of the tooth, should not be that way.

 

it may be an optical illusion, but in post #4 some of the large ring edges on the outside look worn to me. I don't seem to have anything like paint of my macbook to highlight what I'm seeing.