The FSM calls for 80wt GL-4 in the transmission & transfer case.
Differentials are 80-90wt GL-5 for open, & Trac-Loks want 80-90wt GL-5 LIMITED SLIP.
Personally, I would NOT use a GL-5 oil where GL-5 oil is called out. GL-5 has a higher sulphur content which will attack brass components. A differential has no brass parts, so the GL-5 is useful.
The oil weight is probably fine. Worry about the additives.
I'd rather be lost on the trails than found at home!
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