Gates 39475 Accessory Drive Belt Tensioner Assembly - Alternator and Water Pump or Serpentine

OE Belt Tensioner for Ford and Lincoln

The Gates DriveAlign Premium OE Automatic Belt Tensioner, part number 39475, is built for accessory drive systems that need consistent belt control and OE-style fit. It is an OE Exact replacement for select Ford Expedition, Ford F-150, Ford Transit, and Lincoln Navigator applications.

Gates applies its OE system design experience to the DriveAlign line, using rigid manufacturing tolerances to match original fit, form, and function. This tensioner uses a thermoplastic body, a smooth/backside contact surface, and a V-ribbed belt pulley to support stable belt tracking in the accessory drive belt system.

Key Features

• DriveAlign Premium OE Automatic Belt Tensioner assembly
• OE Exact comparison rating for direct replacement use
• Thermoplastic construction
• Single smooth/backside pulley for V-ribbed belt routing
• Two mounting holes for OE-style installation points
• Outside diameter: 70 mm; width: 25.5 mm
• Bearing bore inside diameter: 17 mm

Product Details

This Gates 39475 tensioner is engineered for accessory drive belt systems where proper belt tension is critical to alternator and water pump operation. It is listed for 2018-2025 Ford Expedition, 2025 Ford Explorer, 2022-2023 Ford Explorer, 2022-2025 Ford F-150, 2017-2020 Ford F-150, 2023-2025 Ford Transit, 2023-2025 Ford Transit-150, 2023-2025 Ford Transit-250, 2023-2025 Ford Transit-350, 2023-2025 Ford Transit-350 HD, 2018-2024 Lincoln Navigator, and additional 2020-2021 and 2021 Ford F-150 and Transit configurations. This part cross-references Dynomax 39475 for the same application.

What It Helps Address

• Belt squeal caused by weak or inconsistent tension
• Accessory drive belt flutter or vibration
• Uneven belt tracking on V-ribbed systems
• Loss of belt tension from a worn tensioner assembly
• Drive belt noise during alternator and water pump operation

Installation Notes

Verify the vehicle’s engine and accessory drive configuration before ordering, especially on Ford Transit and Ford F-150 applications with alternator and water pump routing. Confirm the OE comparison rating, mounting hole layout, pulley style, and belt path against the original tensioner. Use the listed fitment details for 2017-2025 Ford and Lincoln applications, including Ford Expedition, Ford Explorer, Ford F-150, Ford Transit, and Lincoln Navigator.

Quality Assurance

Gates manufactures DriveAlign tensioners to rigid tolerances and OE specifications so the part matches original equipment fit, form, and function. The 39475 is built as an OE-style replacement for service work on select Ford and Lincoln accessory drive belt systems.