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this has been discussed many times. use the search feature and you'll discover a wealth of knowledge!
i have 315/75r16's (35x12.50) on my 04 w/ no lift. tires rub the inner fender at full turn. i plan on downsizing to 33"s and adding a 2" lift. it depends on how much off roading you plan on doing. i wouldn't go bigger than 33"s w/o a leveling/lift kit.