One of my truck manuals states that you should put Permatex Aviation Form A
Gasket sealer on the bolt threads. You might try some also on the surfaces
where it is leaking after they are throughly cleaned. Let the Permatex
harden/dry overnight befor applying lubricant.
Another thought is that if the jeep is like larger trucks, then there should
only be grease in the knuckle and that oily leaks indicate gear oil is
getting into the knuckle.
Hope this helps
Steve