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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.
Many Rams come with 33 in tires from the factory. I think you are confusing rim size with overall wheel/tire size. You can put 33s on nearly any wheel size available.
A larger wheel diameter does not mean that the tire is larger... you need to go by the OD of the tire and the tread width. On a stock offset wheel, 35x12.50 RXX will fit an un-lifted 2500 with minimal rubbing. 2.5" lift coils will make the situation better.