[Carlson327]

With help from this site, the Haynes manual and the Jeepin.com article, I performed this repair on my '92 4.0L, 4X4. As mentioned on Jeepin.com from Dale's response, it's a dirty job. I never was able to get the pan completely off (I was able to get it dropped, but not out), but got enough clearance to change the rear main seal without too much difficulty. I replaced the oil-pan gasket by just working it back through and under the oil pickup assembly.

In replacing it, I screwed up two seals, and this caused me to make two trips to the auto parts store, so get at least one extra one. You can always return it if you get the first one right. The problem was pushing the top half of the new seal back up into the engine. It would get stuck about 3/4 of the way in and then after I forced it a bit, the edge of the opening in the engine would cut into the ridge on the outside edge of the seal, despite having put some liquid soap on the seal. I finally sprayed some WD40 up in the empty rear main seal cavity, and then ther 3rd seal attempt went through with little resistance. I think there was some left over debris that was causing a hangup. I was able to get it all back together and now have much less oil on my driveway. I'm a novice mechanic, and I can say that other than really getting dirty, it wasn't too bad of a job.