Product Details: Update your vehicle with optimized drive belt tension, with the Dayco 89436™ Heavy Duty Belt Tensioner that ensures you're Ready for the Road Ahead™. This replacement device helps create the correct amount of tension on drive belts, delivering ample amounts of power to engine accessories such as AC compressors, water pumps, steering pumps, and alternators. Rattling sounds, chirps, squeals, and visible frays on belts are all symptoms of a tensioner that needs to be checked or removed. FleetPride is your First Click in Heavy Duty®.