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They will stay pretty much 33" That is about as big as you can go without a lift kit. 35's will fit but you will rub the fender when the springs compress on the front.
Easy dirtjumper,,,, I would consider that he was using your sig as to what they were going on,,,,,, don't jump to soon. I have 255/85/16 TRXUS Mud Terrains on my 77 4x, and they are right about a 33 1/2" tire. Check out their website and they have the specs on the tires. http://www.intercotire.com/site.php
Joe