A Jeep 4.0L uses 10W30 oil.
Standard gear lube is fine 80w90.
75W140 is the recommended axle fluid.
A 2008 Jeep Wrangler uses 5W20 engine oil.
5w20
10W30
10w30
10w30
3 quarts per axle
They are on the inside, next to the differental bearings. The entire axle has to be dissassembled to replace them.
1984-1993 Jeep Cherokee XJ Rear Axle 1987-1993 Jeep Wrangler YJ Rear Axle 1986-1992 Jeep Comanche Rear Axle
10w30