I decided on the 75-90. Unfortunately upon inspecting the axles I learned that someone had put grease in there and it was pretty flung out of the joint. We then scooped out as much out as possible and filled with oil. Perhaps it should have been re packed it with moly but since I was expecting oil I did not have any grease.

I flipp-flopped the axles and so far they have been quiet.

The big problem is that they were very obviously worn. They were very notchy and stiff. I'm not confident they will last much longer

I have a line on 2 new factory new MB axles but they are $495 each. Or should/could the axles be rebuilt?