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80w90 The 2004 Rubicon rear differential uses 75W140 synthetic oil. On each side of the differential cover plate is a tag listing specific numbers for the differential. One of the tags lists the lubricant installed by the manufacturer. I also have a 2004 Rubicon and the rear differential on mine uses 75W140 synthetic oil plus 4 oz of limited slip lube. The front differential lists only 80W90 oil with no limited slip lube.
80w90, does not need to be synthetic. If limited slip it will require friction modifier additive.
80w90
80w90
The front differential uses 80W90 gear oil.
80w90
75w90 or 80w90
75w90 or 80w90
The front differential uses 80w90.
80w90
80W90 gear oil.
80w90