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Message: <blockquote data-quote="atlanticblue98" data-source="post: 631967" data-attributes="member: 11091">for underdrive pulleys, you only get two. the underdrive for the crank and the overdrive for the alternator.if you look in the pics, that BBK comes with two. thats just how the arethe underdrive pulley slows down all the rest of the pulleys to reduce power that is lost with the stock pulley, and the alternator overdrive is a larger pulley for the alternator to spin it faster and compensate for the slower pulley speed caused by the underdrive pulley. remember you have to get a new belt as well</blockquote>