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What do you mean when you say front and rear cases? Do you mean the front and rear axles? If so, the front takes 75W90 GL5 and the rear takes 75W140 synthetic. If the rear is a limited slip it needs 4 ounces of limited slip additive when changing.
If you are talking about the transfer case behind the transmission it takes ATF.
Well a general rule of thumb on tcase, and tranny fluids is if it is an Iron case it uses gear lube, if the case is alum then use ATF. very general rule but it works most of the time I have found.
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