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I have a 93 bronco that has the stock susp. Currently I have 31x10.5-15's on it but their getting old. I know I can fit 32x11.5 on it but would 33x12.5 go if I put 2" leveling springs on the front end. I don't really care for much more height just more tire.
do a search, from what i remember you should be fine, just may need to space the bumper out a bit with some washers and you may have some rubbing on the susp.
Take off the front bumper and space it out about an inch. You can either trim your plastic bumper valance or just cut it off. 33's are fine stuffed underneath that Bronco. I wouldn't put anything less than 33's on. Don't worry about the leveling kit. You don't need it.
One thing to remember....what do you have for gearing? I know my 31"s and the stock 3.55s feel like a dog. I have heard some real nightmare stories about people running 33"s and 3.55s (ie...great at 75mph+, but awful around town). Yes, you can fit 33"s stock with just a bumper shim and removing the lower valence (if you dont want it to rub). I have a 1.5" leveling kit on mine, and I like how the 31s look. So I guess my vote is for 32"s tops.