I haven't taken apart a Jeep transmission or replaced a clutch in one, but I used to rebuild transmissions and do clutches in semi and straight trucks, some pickups, cars etc.
If you're sure it's gear oil thats leaking, my guess would be that it's coming from the transmission input shaft collar that the throwout bearing slides on. This collar is usually bolted to the front transmission case and there is a gasket or o-ring behind the base of it. It can be replaced if the throwout bearing wears a ridge or groove into the collar. It also serves to retain some oil to lube the outer input shaft bearing. If that gasket/o-ring failed, maybe that's where your gear lube leak is coming from.
In trucks, I've seen where the input shaft collar breaks or get grooved so bad, that it'll cause a leak. This was usually from loose/worn transmission/engine mounts, loose mounting bolts, etc.
Either way, it looks like you're going to have to pull the transmission out again to fix it.
As stated in another post, if it's engine oil, then you have the engine rear main seal leaking.
Unless Jeep has a very different transmission/clutch design, this would be my best guess. I would try to get a break-down diagram of the transmission to see what's-what with the input shaft/collar design.
Hope this helps!