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3rd Gen Ram Tech2002-2008 Rams: This section is for TECHNICAL discussions only, that involve the 2002 through 2008 Rams Rams. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
I belive 285s are the biggest, they gotta cut about 2 inches off your front fender well thing, the plastic, you wont miss it tho. I dunno bout 305s, you could definetly get 35s with a levelin kit, but there would be some rubbing when you turn all the way to one side or the other.
I recently had 285 65R 20's mounted on my 05 Ram 4x4. They don't rub and fit good. they are about a 34 1/2 inch tire, so 35 will probably be close. I don't know if you have a 4 or 2 wheel drive, but you may think about it.