The Horton DM Advantage Two-Speed Fan Clutch is designed specifically for Kenworth and Peterbilt trucks with a back pulley diameter of 6.36". With an overall length of 9.96", this fan clutch is built to last and withstand the toughest conditions. The Two-Speed Fan Clutch is manufactured for Kenworth and Peterbilt trucks, providing superior cooling performance and reducing the number of fan cycles. The pneumatic fan drive with a higher off speed satisfies A/C engagements and reduces engine drag during highway cruising. With its durable construction and reliable performance, the Two-Speed Fan Clutch is the perfect addition to any Kenworth or Peterbilt truck. FleetPride is your First Click in Heavy Duty®.