With 2.5" inches, you'll have some rubbing with 33's. If you like to play on the rocks, I'd go with no more than 32's (31's would be better) with a 2.5". Anyway, if you do go with 33's, your clutch will go out a little sooner than normal. It's really not that bad, though. I ran 33's with 3.07 (stock) gears for 3 years before I finally did a gear swap. Expect about 70K miles out of your clutch assuming you have a 4.0L.
94 YJ 4", SYE, 33 mud t's on MT classics; 4.10's with Detroit Truetrac in rear