Gates 38321 Accessory Drive Belt Tensioner Assembly - Alternator

OE Belt Tensioner for Ford Super Duty Applications

The Gates DriveAlign Premium OE Automatic Belt Tensioner, part number 38321, is built for accessory drive systems that use a V-ribbed belt and a smooth backside contact surface. It is a direct-fit style tensioner for select Ford E-350 Super Duty, F-250 Super Duty, F-350 Super Duty, and E-350 Club Wagon models with dual alternators.

DriveAlign Premium OE Design

Gates DriveAlign Premium OE Automatic Belt Tensioners are engineered to match original equipment fit, form, and function. Gates manufactures this tensioner to rigid tolerances and specifications, with a steel body and OE Performance rating for dependable belt control in the accessory drive belt system.

• Brand: Gates DriveAlign Premium OE Automatic Belt Tensioner
• Part number: 38321
• Steel construction
• V-ribbed belt type
• Smooth/backside pulley contact surface
• Single-pulley design with non-flanged pulley
• Outside diameter: 76 mm (2.99 in)
• Width: 31.5 mm (1.24 in)
• Bearing bore inside diameter: 17 mm (0.67 in)
• Includes tensioner assembly and bolt

Detailed Product Overview

This automatic belt tensioner is designed for accessory drive belt system service where OE-style belt tension control is required. It is listed for the alternator position on select Ford Super Duty trucks and vans with dual alternators, including 2004-2010 Ford E-350 Super Duty, 2003-2007 Ford F-250 Super Duty, 2003-2007 Ford F-350 Super Duty, and 2004-2005 Ford E-350 Club Wagon. If you are searching for a Ford F-250 Super Duty alternator belt tensioner or a Ford E-350 Super Duty DriveAlign replacement, Gates 38321 is the relevant part number to verify.

This part cross-references Dayco 89364 for the same application.

What This Part Helps Address

• Belt slack in the accessory drive system
• Noise from a worn or weak belt tensioner
• Uneven belt tracking on V-ribbed belt setups
• Loss of proper alternator belt tension on dual-alternator vehicles
• Premature belt wear caused by inconsistent tension

Installation Notes and Tips

Confirm the vehicle’s alternator-position belt routing before ordering, since this tensioner is listed for dual-alternator configurations only. Match the pulley dimensions, belt type, and mounting style to the original unit during replacement. Verify fitment by year, make, model, and position for Ford E-350 Super Duty, Ford F-250 Super Duty, Ford F-350 Super Duty, and Ford E-350 Club Wagon applications.

Quality Assurance

Gates designs original equipment system components and applies OE-level manufacturing standards to this DriveAlign tensioner. The part is built to OE fit, form, and function expectations for the listed Ford applications.