Dayco 89452 | Accessory Drive Belt Tensioner Assembly

Part Number
Accessory Drive Belt Tensioner Assembly

Fits: 04-09 Chevrolet T6500, 04-09 Chevrolet T7500, 04-09 Chevrolet T8500, 04 GMC W5500 Forward, 04-08 Isuzu FTR, 04-08 Isuzu FVR, 05 GMC T7500, 05-07 Isuzu FXR

Special Price $104.39 Regular Price $115.99
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As the major supplier to heavy duty original equipment manufacturers, this Dayco® No Slack® Heavy Duty Tensioner is guaranteed to be engineered and manufactured to the strictest design specifications. The heavy-duty cast aluminum body and pulley arms translate into extra strength and durability. This Dayco® Heavy Duty® Tensioner features a patented “flat spring” design that's engineered to handle the higher torque and power pulses exerted by today's diesel engines. Rugged pulleys with double lifetime lubricated bearings deliver long lasting, dependable service. In addition, this Dayco® Heavy Duty Tensioner features an “extremely damped” design using a wave spring and a metal ring with a bonded rubber surface to act as a “radial shock absorber” for the tensioner arm.

BRAND: Dayco




Belt TypeSerpentine
DirectionCounter Clock Wise
Number of Pulleys1
Pulley 1 Diameter86.5
Pulley 1 FlatY
Pulley 1 Width39.4



  • NAPA: 38579
  • General Motors: 15098394
  • Gates: 38579
  • General Motors: 12568253
  • CARQUEST: 38579
  • Goodyear: 49557
  • General Motors: 15258253
  • Duralast: 89452


  • 2004-2007 Isuzu FTR
  • 2005-2007 Isuzu FXR - Position: Fan, Alternator and Air Conditioning
  • 2004-2007 Chevrolet T7500
  • 2005-2005 GMC T7500
  • 2004-2004 GMC W5500 Forward
  • 2008-2009 Chevrolet T8500 - Position: Fan, Alternator and Air Conditioning
  • 2004-2008 Isuzu FVR
  • 2008-2009 Chevrolet T7500 - Position: Fan, Alternator and Air Conditioning
  • 2008-2008 Isuzu FTR - Position: Fan, Alternator and Air Conditioning
  • 2004-2007 Chevrolet T6500
  • 2004-2007 Chevrolet T8500
  • 2008-2009 Chevrolet T6500 - Position: Fan, Alternator and Air Conditioning
Customer Questions
Can a serpentine belt cause smoke?
Yes, a serpentine belt can cause smoke. A serpentine belt is an essential component of a vehicle's engine system. It drives various accessories such as the alternator, power steering pump, water pump, and air conditioning compressor. If the serpentine belt becomes worn, damaged, or misaligned, it can cause friction and generate smoke.
Why is my serpentine belt squealing?
The serpentine belt can squeal due to various reasons, including tension issues, worn-out belt, or a problem with the belt's pulleys.
Is my serpentine belt too tight?
If your serpentine belt is causing issues like excessive noise or accelerated wear on the pulleys, it may indicate that the belt is too tight.
Why did my serpentine belt come off?
Serpentine belts can come off due to factors such as belt wear, improper tension, misaligned pulleys, or a faulty tensioner.
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