Underdrive Pulleys 4.6L

The Steeda Underdrive Pulleys are engineered to enhance the performance of your 2005-2010 Mustang GT equipped with the 4.6L engine. As a leader in underdrive pulley design, Steeda was the first to achieve SFI approval for 4.6L engines and developed these pulleys through a unique partnership in Ford's technology transfer program, ensuring they possess the correct torsional vibration dampening characteristics. Unlike "piggyback" designs from competitors, Steeda's crank pulley is a robust one-piece nodular iron component with injection-molded rubber, specifically selected for its vibration absorption and high-temperature resistance. By reducing accessory speed by about 25%, these underdrive pulleys minimize parasitic drag on the engine. This results in a reported increase of up to 10 horsepower and improved gas mileage, allowing you to reclaim power that would otherwise be consumed by belt-driven accessories. These pulleys are specifically designed to fit the 2005, 2006, 2007, 2008, 2009, and 2010 Ford Mustang GT models with the 4.6L engine. Installation involves raising the front of the vehicle and placing it on jackstands or drive-on ramps, with required tools including a calibrated torque wrench, 7mm socket or wrench, high-temperature silicone sealer, and a three-prong puller. Some sources mention that for 2001 models, owners must read specific instructions regarding the older style pump with a longer shaft. The kit does not include an idler or tensioner pulley.