i ran 235's stock and now with just over 2 inchs of lift on the front no problems (bit of rub on the frame at full lock, took the hammer to it and its gone now)
with the 3 inchs of lift 31's fit with some rub. that spot on the rear of the fender rubs slightly on flex with steering, then a little on the frame at full lock.
all depends on the rims. im running standard sidekick 9 hole rims (15x5.5) bit skinny for the 31's but they work well. rear stuffs right up in flex does touch when loaded down and it squats on bumps.
all in all its giving me ideas on what to do next to get some room for my chains...