Check out my post about the Goblin's new shoes. I just put 33-10.50x15 Swamper TSL radials on a 93 Tracker running a 4" body lift and 1.5" coil spacers. I had to do some trimming and floor pounding to clear them and I noticed tonight while flexing on a rock that I'm going to need to do a little rear quarter panel modding as well. Not counting the fulcrum-lever effect of the IFS, I'm running a total of 5-1/2" of lift and you're running 5" total. Factor in the IFS effect of the coil spacers and you and I are probably about even. If you don't want to pound/trim, then I would guess that the biggest you can go is 32-10.50. Forget the 34's, you'll need to do some serious trimming/pounding to fit them!