Re: How big for a four-banger?
I would go ahead and get some 32s. Mine has 33 mudders and it handles pretty good. I doesn't accelerate like a sports car or anything but I am sure not the slowest vehicle out there. You just have to change gears more often. Or if you really want aggresive tires get an extra set. I relize that is not cheap, but sometimes you can find some good used deals.
91 YJ, 4" lift, 33" BFG MT, Herculined tub, Stockie 4 banger, and no money