I think I put some automatic transmission oil in there the last time, but I can't remember.

I was getting a wierd groaning noise form back there, when I read that I probably had the wrong type of oil in the Diff. The oil guy took a qualified guess and gave me what I think was automatic transmission oil. Worked like a charm.

Now I need to replace a seal down there and will be needing some more of the greasy stuff. What do I need??????