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Yes the 305/55-20 are just shy of 34" by 1".. they are 33's. I think you would barely be able to tell the diffrence between a 33 and 34 inch tire... Just stuff some 35's under there.
tardman... it all depends on wheel backspacing. But, there arent too many people running bigger tires that havent installed a leveling kit. My guess would be that 33's on stock rims would fit... im thinking that 34's would not fit...