Gates 39474 Accessory Drive Belt Tensioner Assembly - Alternator or Serpentine

OE Automatic Belt Tensioner for Ford Accessory Drive Systems

Gates DriveAlign Premium OE Automatic Belt Tensioner 39474 is built for Ford accessory drive systems that use a V-ribbed belt. It is engineered to match OE fit, form, and function for consistent belt control on applications such as the Ford F-150, Ford Ranger, and Ford Bronco.

The Gates DriveAlign Premium OE Automatic Belt Tensioner line focuses on OE-style replacement parts manufactured to tight tolerances. That means the pulley, mounting points, and overall assembly are built to align with factory specifications for the accessory drive belt system.

Key Features

• Part number 39474 automatic belt tensioner assembly
• OE Performance grade for factory-style replacement
• Thermoplastic construction
• Single pulley design with smooth/backside running surface
• V-ribbed belt application
• 2 mounting holes for direct-fit installation
• Pulley dimensions: 2.76 in. (70 mm) outside diameter and 0.94 in. (25 mm) width
• Bearing bore inside diameter: 0.67 in. (17 mm)

Detailed Description

Gates 39474 is an accessory drive belt tensioner assembly designed for vehicles that rely on automatic belt tension control to maintain proper belt tracking and tension. Built with OE-quality standards, this tensioner is manufactured to rigid tolerances so it matches the original fit and function expected in the belt drive system. It is a direct replacement choice for Ford F-150, Ford Ranger, and Ford Bronco applications listed below.

This part cross-references Litens 999684A and Four Seasons 39474 for the same application. If you are replacing a worn Ford F-150 belt tensioner or servicing a Ford Bronco serpentine drive, Gates 39474 provides the correct OE-style configuration for the listed vehicles.

Vehicle Fitment

• Fits 2021-2025 Ford F-150, Alternator
• Fits 2024-2025 Ford Ranger, N/A
• Fits 2021-2024 Ford Bronco, Serpentine
• Fits 2015-2020 Ford F-150, N/A

What It Helps Solve

• Belt squeal caused by weak or inconsistent tension
• Visible belt flutter or poor belt tracking
• Accessory drive noise from a worn tensioner pulley or bearing
• Loss of proper belt tension in the serpentine drive system
• Premature belt wear from misalignment or tension instability

Installation Notes and Tips

Verify the vehicle year, engine accessory drive layout, and belt routing before installation. Compare the original tensioner to the replacement part number 39474, pulley style, and mounting-hole layout to confirm the correct Ford F-150, Ford Ranger, or Ford Bronco application. Inspect the belt, pulleys, and related accessory drive components for wear before reassembly.

Quality Assurance

Gates designs its DriveAlign Premium OE Automatic Belt Tensioners using original equipment system knowledge and manufactures them to rigid specifications for OE fit, form, and function. The result is a replacement tensioner built to meet factory-style requirements for the accessory drive belt system.