I don't know a whole lot about wranglers but i'd say 33"10.50s would be the biggest I'd go with stock height. even with these you might be facing tire rub.
I have a stock '99 Wrangler Sport, its got 31"s no problem. I'm pretty sure you can't go higher tho. 32"s are really risky, and theres no way you'll fit 33"s. You could go w/ a 1 in body lift and/or coil spacers to get the extra clearance.
now.. supposedly 29 by 9.50s are the biggest you can go or at least that's what a tech would tell you but really 31s by 10.50s will fit with minor rubbing at the most. theres no way 33s will fit under there. but if you want assurance try a 2in spacer lift. thats an easy cost efficient way to make sure the tires would fit.