Yes, 33x11.5 will fit the 15x8 rims. Some tire rubbing at full lock . . . maybe. But you can 1) adjust the stops (I think you can on a TJ) or 2) live with it.
However, I prefer the sidewall charachteristics of a 10.5 wide tire on a 15x8. While not as widely availible, some tires can be found on 33x10.5, most notably BFG MTs and ATs - this is what I will be doing in a few months.
'82 Scrambler - NV4500/4.5" lift/33" Toyo MTs/4.0/twin stick, and my windshield washers work! Full 1/2 cab Cage
2004 Grand Limited 4.7 HO - OH Boy!
2010 Grand Laredo 5.7 Hemi - SICK - work vehicle -gone - replaced by an 08 Tahoe - nice ride.
"Both my Doberman and my Jeep can accurately be described as 'black and rust.'"
"I got a fever . . . and the only prescription is more cowbell"