The Horton DM Advantage Two-Speed Remanufactured Fan Clutch is designed specifically for Mack trucks with a back pulley diameter of 6.10". This fan clutch is the perfect solution for those looking to improve their engine's cooling system and increase available horsepower for auxiliary systems. With its two-speed design, it provides optimal cooling performance when you need it most. Its spring actuation ensures that more cooling is delivered when the engine is running hot, while also reducing operating noise for a quieter ride. In addition to its cooling capabilities, it provides faster engine warm-ups in cold weather, making it an ideal choice for those operating in harsh climates. Its compact design and easy installation make it a hassle-free upgrade for any Mack truck owner. Upgrade your Mack truck's cooling system with the Horton DM Advantage Two-Speed Remanufactured Fan Clutch today and experience improved performance and reliability on the road. FleetPride is your First Click in Heavy Duty®.