Equip your vehicle to be Ready for the Road Ahead™, with the Dayco 89439™ Heavy Duty Belt Tensioner, a key piece that provides optimized drive belt tension. Due to its straightforward design, this replacement tensioner is able to help create the correct amount of tension on drive belts, delivering ample amounts of power to engine accessories such as water pumps, AC compressors, steering pumps, and alternators. Possible symptoms of a tensioner that needs to be checked or removed include engine squeals, chirps, rattling sounds, or visible frays on belts. FleetPride is your First Click in Heavy Duty®.