The Horton Drive Fan Clutch is the perfect solution for your truck's cooling needs. With a back pulley diameter of 9.06" and a front pulley diameter of 7.25", this fan clutch is designed to fit perfectly with your Mack truck. This fan clutch has been tested to provide extreme durability, making it the perfect choice for heavy-duty applications. Its piston friction disk with unique fin design ensures better heat dissipation, while the dust seal protects components from dirt, debris, and moisture for increased reliability and life. FleetPride is your First Click in Heavy Duty®.