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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.
Number one by far is 4.56 gears, followed by Superchips Flashpaq (although ditching it in favor of an SCT is in the not-too-far off plans) and then the Pacesetter LT Headers...
if you have stock 3.92 rear end, and go to 4.56, you just increased the torque at the wheels by about 16%. Granted it's kind of cheating, and you'll run through the gears faster at the expense of top end, but its going to feel like another 60 ft-lbs of torque!! (until you hit about 70 anyway ). i'd imagine that'd be on anyone's short list (that can afford them)