Mine is lowerwed 3" (which I beleive is what you will get from that kit) and have the same size tires on the rear. my fronts are 225/75 but have ample room left over (the 255s may be a little big for the front) as for the fender flares, I dont have them but they mount outside the opening and I cant see them being an issue, if anything you may have to trim the inside lip.
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