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Stock JK TechBulletin board forum regarding issues with OE (original equipment) components of the Jeep JK Wrangler (Rubicon, Sahara, Unlimited and X) such as factory suspension parts, engine, transmission, body parts, interior fixtures and the on-board computer.
I assume since it is a rubi it has Dana 45 front & rear. They will take about two quarts each. Can't go wrong with any approved diff oil. If you tow you should use synthetic and a heavier weight in the rear. All else fails check your owners manual.
Try putting two quarts in the front and I think you'll have a mess. I believe the capacity difference front to back has to do with axle tubes.