well, I crawled under the jeep to see exactly where it may be coming from. It wasn't the oil sending unit, definitely seemed to be the rear main seal. With a flashlight, I was able to see that it was coming right from the bottom of where it seals. I figured, it was worth a try and put some RTV around the area. So far no leaking. It may not look pretty and may just be a temporary fix, but better than dropping some cash right now.
Try this site above, it helped me save a lot of money
The only advice I have is when it is time to put the gasket and oil pan back on. My recommendation is to put the gasket onto the engine block first and then put the oil pan in place. Also make sure the gasket seats nice inside the rear bearing cover!!!! That is where I made my mistake and had to do the job all over. I was trying to put the gasket onto the oil pan first and then put them in place together. Doing it that way you will never be able to get the gasket to sit right in the grove (bearing cover). They sell a gasket spray that is sticky that will allow you to place the gasket onto the engine block and then give you time to put the oil pan in place. Also what I found out after the fact is that you can buy these screw clips that screw into the engine block. These clips will allow you to snap the gasket into place and oil pan. Once they are in place you unscrew the clip and replace it with your original oil pan screw.
Location: Ponderosa Pine Country, where the Wolves are hungry!
Before spending your money to get the rear seal changed, check and make sure that the last two pan bolts closest to the seal are tight. My friend had the same problem on his 4.0. We tightened the two bolts and his leak stopped.