I use Mobile One 75wt in the Diffs for the last year with no problems, and I put it in the new T-case when I installed it before Laborday. I can shift the T-case without the 90 having to be rolling, infact it goes in and out very easy and never makes any noise. Oh and NO leaks either.
Don't forget to
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first then ask questions later! The loose nut behind the wheel