from my exp. your biggest obsticles will be the tires hitting the fenders on bumps, but you can drive like a low rider till the lift comes, and worse, you need at 4.5" backspacing or you will hit the springs while turning, the stock rims are 5" and 5.5" for the aluminiums and will rub quite bad (as mine do now.....39.99 summit racing cure coming (soft 8s))
Sold) 94 YJ, 4.0L 5 sp manual, Hard top, 33/12.50s, 4.10 ring&pinions, Polished D30 w/Aussie front, 8.8 rear w/ LS, 2.5" RC, 2" BL, 5/8" booms, TJ flares, SYE, custom F/R bumpers and rock sliders, 8k winch, dual optimas, HO alt.
2) (Sold) 99 TJ, mustang 5.0 GT 40, AX15/231J, trektop, 37x12.50r17 cooper STT, superlift 6" long arm, D30/44 w/ ARBs & yukons, customized warn bumpers, custom sliders, 12K winch w/ synthetic rope, custom paint
3) 2007 JKU being built now