Mine was leaking from the front pump. The input shaft seal was OK, but the leak was coming from behind the pump.
I looked all over town and was unable to locate a new gasket and O-ring without buying a gasket kit. While searching, I stopped at a local trans shop, where I was advised to remove the pump (instructions below) and try my best to salvage the old gasket. I removed most of the gasket, except the part with the oil passages to the pump, cleaned everything really well with brake cleaner, then applied a thin coat of black RTV sealer to everwhere the gasket covered, and a light coat of RTV to the outside of the O-ring which surrounds the outside of the pump. I let is sit for a few minutes in the air, then put it all together.
While I had everything apart, I took the opportunity to replace the filter and pan gasket.
My brief visit with the transmission shop guy was quite educational:
I learned that the rear flange of the torque converter (the part that goes into the pump) is prone to cracking on the edges of the slots which drive the pump. You need to make sure your converter isn't craked there, or you will be guaranteed a leak when you reassemble.
Also, you want to be sure to use a scotch-brite pad to buff up the flange on the torque converter to ensure the new seal doesn't leak.
Inside the bell housing, on the bottom corner, there is a plug. To avoid future leaks, remove it and coat with RTV, then reinstall.
All in all, the removal and replacement of the transmission is a bit of a PITA. The parts are heavy, and high up.
Use a transmission jack. It's worth the money. I didn't have one, and I live far away from a Harbor Freight, plus I wasn't willing to pay my local parts store price. I ended up tack welding a 18 inch piece of flat steel to the top of my floor jack, then another one across the top of the first, making a "T" shape. It worked fine, but not everyone has a good welder, nor are they willing to compromise a good jack. Once I was done, I took one end of the "T" and stuck it under my differential and attampted to lift my Jeep. The pieces broke right off, as planned.
***pump removal instructions***
Remove torque converter.
Stand transmission on end in 5 gallon bucket, so that bell housing is upward. This is necessary to keep internal parts in position when pump is removed. Don't skip this part, says the trans guy!
Remove bolts around the pump. 2 holes on the front of the pump are threaded for 3/8 - 16 bolts.
Screw in 3/8 - 16 bolts into the holes on the front of the pump. These will press the pump out of the housing.
Pull pump out.
I hope this helps!!