My '94 YJ has been a chronic leaker at the main seal ever since it was new. The original owner had the main seal replaced at 10 & 20k miles, then traded it off at 25k. I had it replaced at 28k, along with a new clutch to replace the oil-soaked, chattering original. That seal made it maybe 7k before it started to drip, I finally had had enough and replaced it again at around
45k. By 52k it was dripping again, which I ignored until 63k, at which time I replaced it yet again. Frankly, the one I pulled out looked as good as the new one I put in. The new one didn't waste any time dripping, it immediately leaked as bad as the one I took out. ENOUGH!Ok, this much we know: The pan gasket isn't leaking, dry all around. Neither is the valve cover gasket, it's as dry as a bone at the back of the cyl head and all around as well. The thing drips from behind the separator plate between the eng and trans, and it is motor oil, not gear lube that's leaking.
When I pulled the lower rear bearing half it showed signs of seepage behind the seal. When I put the new one back in the upper slid in very easily, and the lower half fit perfectly. The sealing surface on the crank is fine. I sealed the bearing cap mating surface edges with high temp RTV per the manual. All went together easily, torqued up fine, etc.
The only idea I have left is that the pressed in oil galley plug at the back of the block may be seeping, but to know for sure I'd have to pull the trans. Otherwise, I'm out of ideas. HELP!!!!