you can pull it all as one unit, but you'll have to remove the entire front of the XJ. there is like a little "crossmember" that sits on top of the grill, you have to take that off, the grill, lights, radiator and everything else. basically when you get done all you have is the bumper and fenders. (mine looks like that right now cuz i'm doing a engine swap and it's easier that way then trying to pull it straight up).
you'll have to put something under the t-case to support it and maybe even allow it to roll a little. since you're pulling such a long piece, you'll have to tilt the engine back and pull it at an angle going up and forward. if you can put it on jackstands and your engine hoist goes high enough, it'll be relatively easy to do it.
just curious.........why are you pulling all of it???