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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.
Have you looked at the thread I linked? 35's will fit, but the backspacing clearance is going to be your issue. Keep in mind that a 35" tire is not usually a true 35", but diameter is usually about 1/2" smaller and rounded up for marketing. If I'm not mistaken, 35" tires will fit a stock 4WD without cranking the t-bars, you just can't hit any speed bumps. :P The stock 20" wheels come with 33" tires on them, and you see the wheel well clearance there.