You need to move it back and down to be able to get in about to remove the Clutch and Flywheel (failing to change out the flywheel for an exchange one from AWD is FOOLISH!, seeing as the box is off.) but it can stay on the jack
The Driveshafts are kept in place on the Gearbox splines by a dowel pin that runs right through the Driveshaft body about 1" from where it meets the gearbox. Tap these right out to be able to remove the driveshaft. There isn't enough room to remove the Driveshaft in situ, so once you have splitted it from the Engine, move the box back about 5" and you'll have the room to remove the Driveshafts one at a time.
I'll assume you know that you need to remove the Propshaft, linkage, etc?
Russell