Absolutely. And while your Rubicon has f/r lockers, it does not have a Tracloc which is a clutch-based limited slip differential used in some non-Rubicons
80W-90 is fine, so is nearly any viscosity so long as it is a GL-5. Lower viscosities for lighter duty or cold conditions, higher viscosities for heavier-duty needs (like towing) or hot weather.
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