4.6L Underdrive Crank Pulley Kit

The Steeda underdrive pulleys are a precision-engineered performance upgrade for 2005-2010 Mustang GT models equipped with 4.6L engines. By reducing the rotational speed of engine accessories by approximately 25%, this system minimizes parasitic drag, which directly translates to gains in horsepower and improved fuel mileage. Unlike "piggyback" designs, this set features a one-piece nodular iron and injection-molded rubber crankshaft pulley specifically developed to withstand high underhood temperatures and provide proper torsional vibration dampening. These pulleys are the only units of their kind developed through a partnership in Ford's technology transfer program, ensuring O.E.-level build quality and performance. Installation requires specific hardware included with the kit, such as a 12mm x 60mm bolt used to start the new balancer pulley onto the crankshaft. Proper installation is critical, requiring the balancer to be torqued to 66 lb-ft. This product is compatible exclusively with 2005-2010 Mustang GT 4.6L engines; ensure your vehicle configuration matches these specifications before installation.