So what is the forum recommended lube for the rear diff and how much. My rear whole diff end to end was replaced at 44,000 miles I have 63,500 now and want to replace with some good stuff then I will leave alone for awhile. Doing the PTU fluid this week with Amsoil severe duty, it too was replaced at 44,000. I will replace the PTU fluid every 20 or 30,000 miles...