It sounds like you're leaking fluid out of the front seal for the clutch shaft, or the gasket that goes between the front bearing cap and the
Transmission . Those would be the only two places that would leak fluid into the bell housing or between the bellhousing and
Transmission unless it's coming from the motor.
As for the gasket between the
Transmission and the
Transfer Case , there are two different gaskets one is fairly open, and one is solid. I got the solid one with the
Transmission rebuild kit, and the open one with the
Transfer Case rebuild kit. I used the gasket that was more open. I couldn't see where it would hurt the
Transfer Case to be too full. The vent is on the very top.
Another place for leaks is the bolts that hold the
Transmission and
Transfer Case together. The holes are tapped all the way through into the
Transmission case. I used Permatex grey RTV sealant to seal all of my gaskets and the threads of the bolts. I put a thin coat on both sides of the gaskets. I have zero leaks for the first time since I bought it in 1992. (No puddles in the driveway)
I'd pull both the
Transmission and
Transfer Case , pull them apart, inspect them for worn or broken parts, and rebuild them. I spent less than $300 on both including renting the
Transmission jack and buying a few tools. On the
Transmission , I got the rebuild kit. I replaced all of the bearings, synchros, snap rings,seals and gaskets. All of my gears were in great shape. On the
Transfer Case , I just did the seals and gaskets everything in there was in great shape too. I should have bought new thrust washers for the intermediate gear, but mine were still within specs. If you have any questions on how to do something on the
Transmission and
Transfer Case , just ask. I'm more than happy to help out.
Dave S