Engine: 1998-2001 360ci (5.9L) Magnum V8 245hp(standard), 250hp(Sport package)
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I have 285/65/18's on my truck..about 33" tires. I don't have a lift either..They don't rub at this size either. I'd say this is pretty close to the largest tire size you can have without a lift, but I'm not an expert by any means! Hope this helps!
My build thread! http://www.ramforumz.com/showthread.php?t=129336