Gear oil...
I use Red Line 75W90 synthetic gear oil. Never had a problem spinning both wheels. Guess it could if the trac loc needed a rebuild, but it wouldn't matter what type of oil you used. All you need for the diff cover is RTV sealant. I use the orange RTV for the diff cover. The upper intake gasket can be found at most auto parts stores. I used the Fel-Pro and have re-used it several times with no problems.
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