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Dayco heavy duty automatic serpentine belt tensioner 89441 boasts a high-strength cast aluminum body designed to keep contamination out and resist cracking, fatigue, and deformation. Each tensioner Includes rugged pulleys with dual lifetime lubricated bearings to deliver long lasting, dependable service. 74mm pully diameter, 39.25mm pully width. Counter clock wise direction. For GM., Ford, Freightliner, IHC, Kenworth, Mack Peterbilt, Sterling Truck, Volvo and Western Star applications.,
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