ouch, looks like that isn't happening...lol i'll just deal with the leak...

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You do not have to drop the transmission, on the 4.0. You may on the 4.7, but the 4.0 is a whole different animal. I have never worked on the 4.7, only the 5.8 and that was enough for me to appreciate the virtues of the 4.0. The rear main seal on a 4.0 is a two piece seal that is located under the last cap of the crank. You have to drop the pan, pull the cap, pull the upper part of seal out and pull the bottom part of the seal out, feed the upper seal back up and around, fit the bottom back in the grove and retorque the cap back into place. He should be able to replace both seals for about 50-60 bucks. The biggest PITA is going to be unbolting/rebolting the pan back up.

Let me see what I can dig up for you. I will get back to you!

I found something that looks REALLY helpful. Thanks everyone, I think I am gonna give this a shot soon!

http://dailydriventj.com/forum/viewtopic.php?t=811

ANY comments please let me know before I start ripping this thing off sat....

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Done. Did it in my driveway in about 6 hours. Went well. Messy but easy.

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I know this was a year ago, but just wondering if you ended up taking off the starter or anything like that to get the pan off? Or did you get the pan to drop with a little wiggle room?

we will see. doing all this rt now on a 04 .4.7. so far i cant get the oil pan off . ill try the box cutter thing in morning

2004, WJ, overland ,,4.7 HO...welp! i did it. what a biitch it was.. separating the windage tray was not easy. Box cutter did nothing, The gasket was to hard from age .need a putty knife and tap it along to break the seal. had to remove front y pipe cut off with saws all. I tried just to seperate the y from exhaust system with come along and heated cherry red with a torch. it didn't budge! remove right side control arm to get to y pipe/manifold bolts. 'Doesn't leak a drop now!' also had a leaking oil sender unit. power washed bottom of engine and trans and transfer case , changing trans fluid next. you will need 2" Scotch Brite Surface Conditioning Discs Coarse blue, ..'brown' medium if your gasket was dried and hard as rock, my oil pan had some strange ripples in the one corner that was why it leaked, i smoothed them over with the disc knowing the gasket would seal a slight valley but not 6 or so ripples. also you will need new mopar non spin lock washers for your y pipe manifold bolts, they are off threads and can only be used once!!! i tried to reuse and ended up having to cut one of the bolts off with a dremell cut off wheel.!!! Get a magnet for your oil plug , found nice clump of metal dust on buttom of pan.

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You don't have to drop the tranny to get to the rear main seal. If you have a two-piece RM seal you only have to drop the oil pan to access it. Here is a pretty good write up...

http://jeepin.com/features/rearmain

Edit: Didn't see the post above about not dropping the tranny...didn't mean to be redundant. This link is still pretty helpful though.

I have the same engine on my 04. Where was your pan leaking? I just changed my oil and noticed mostly surface rust, but there were a few questionable spots. I scraped and sanded the pan and am coating it with black high-temperature paint.