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Synthetic lube
About 1 quart of gear lube
75 80 90 gear lube is fine
Usually you fill it to the bottom of the hole.
75W-90 synthetic gear oil
85W90 gear oil and add a bottle of positive trac. lube also.
5800 rpm
yama lube sae 10w-40
Noises like grinding. Low power to the wheels when you accelerate. Noticeable leakage from the seal of the differential. Most of the time it just needs lube.
3 quarts per axle
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.