Ok on closer inspection I agree at least these side bearings are nearly shot. You can see the one race has a lot of spalling. The other one appears to maybe be corrosion, it's not as bad as it looks in the photo, but still not worth keeping. The rollers are visibly scored; the worse of the two is also feelable with a fingernail, though not enough to grab. I noticed the bores are also scored noticeably. What is the fix for this?
The front bearings to me seem fine. Not 100% new but a lot better than the side bearings. I believe this differential has never been torn down, so it's 93k miles on these, and these look like they could do some more.
Side bearings:
Side bearing bores:
Front bearing races:
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