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Hello and thank you for your question,See the transmission specs in the first link,
All 4-speed transmissions-SAE 85W/90 gear oil
All 5-speed transmissions-MERCON® (Dexron®II) ATFAnd the transfer case in the link below,
Transfer Case Fluid Type also calls for -MERCON® (Dexron®II) ATFThe rear Differential calls for 90w gear oil .
One other thing, if you have a limited slip rear diff be sure to add some friction modifier as well .
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