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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.
When I put 33x12.5 tires on mytruck with no leveling kit, at full turn and hit a bump I got a slight rub. Not bad but it did rub. As soon as I got my leveling kit no rub any where.. Also this was with aftermarket rims with I think a backspacing of 4.5 not sure on that tho.
On the stock rims that have next to no offset you might bump at the extreme turn, but other than that you should be fine. Before lifting and going to 35s I ran 33x12.5x17s on Mickey Thompson Classic IIs with a 4.5 backspace and never came close to rubbing...