Neither. Even on stock vehicles, if you jack up the front end to "full droop," you should be able to slip the oil pan out without pulling the engine or the transmission. Since it's a two-piece seal, you can remove it with everything else in place - I've done it, and so have many others.
Search around for hints and tips - it's something that can be done in a day, if you buckle down. Make sure you get the later (1996-up) oil sump gasket - it will fit, and it's one-piece moulded rubber, so you don't have to wrestle with it as much as you do the four-piece cork-and-rubber version. (I know it fits - I've got one on my 88...)
As I'd said, I've covered this myself more than a few times, and I'm not going to go into it again. There are quite a few others here who will give you the same response.
Search for <rear main seal>, looking for any or all of the following usernames:
5-90
Eagle
Dr. Dyno
Ed A. Stevens
gojeep
And those are the ones I can come up with offhand...