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I put a crank underdrive pulley on my old 99 Dodge Ram and noticed ZERO improvement in either driveabilty or MPG. There probably was some improvement but not that I could document. I just don't think it's worth it especially on a truck so I took it off and sold it. An underdrive pulley system reduces cooling capability and your power steering boost at low speeds. If you ever tow anything with your truck this would NOT be a mod I'd advise. I think those pulley sets are more aimed at cars, especially guys who track them (and have AC deletes and other track specific mods).
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