Gates 90K-39221B Serpentine Belt Drive Component Kit - Alternator and Water Pump

Heavy Duty Serpentine Kit for Transit

Gates FleetRunner Heavy Duty Serpentine Kits simplify accessory drive service for Ford Transit vans that run the alternator and water pump on the same belt path. Part number 90K-39221B combines the belt and tensioner in one service kit, helping you restore proper serpentine system operation with components matched for the application.

Built for fleet maintenance, this Gates Accessory Belt Drive Kit (Heavy Duty) is a practical choice for Ford Transit, Transit-150, Transit-250, Transit-350, and Transit-350 HD models in the listed applications. The 90K-39221B kit is centered around the belt dimensions and tensioner assembly needed for the accessory drive system.

Key Features

• Gates FleetRunner Heavy Duty serpentine kit for accessory drive service
• Includes belt and tensioner for the specified application
• Belt part number: K060547HD
• Tensioner assembly part number: 39221
• Outside circumference: 1404 mm (55.276 in)
• Belt top width: 20 mm (.807 in)
• Fits Ford Transit vans with alternator and water pump drive routing

Product Details

Gates 90K-39221B is a serpentine belt drive component kit from the FleetRunner Heavy Duty line, created for proper serpentine system service on demanding commercial vehicles. Gates notes that some FleetRunner kits incorporate updates based on long-term heavy-duty maintenance experience, which can address issues seen in real-world fleet use. For buyers searching for a Ford Transit serpentine belt kit, Ford Transit-150 accessory belt drive kit, or Ford Transit-350 HD belt and tensioner replacement, this part number provides a direct service solution for the listed vehicles.

This part cross-references Gates 90K-39221B for the same application.

Common Problems This Kit Can Address

• Squealing or chirping from a worn serpentine belt
• Belt tracking issues caused by a fatigued tensioner
• Accessory drive service needs on Ford Transit alternator and water pump routing
• Visible belt wear, glazing, or cracking
• Loss of proper belt tension in high-mileage fleet service

Installation Notes and Tips

Verify the existing belt routing and compare the belt dimensions before installation. Inspect pulleys, idlers, and the accessory drive path for wear or contamination before replacing the belt and tensioner. Confirm vehicle application by year, model, and accessory drive configuration for Ford Transit, Transit-150, Transit-250, Transit-350, and Transit-350 HD.

• Fits 2018-2025 Ford Transit, Alternator and Water Pump
• Fits 2015 Ford Transit, Alternator and Water Pump
• Fits 2018-2025 Ford Transit-150, Alternator and Water Pump
• Fits 2015 Ford Transit-150, Alternator and Water Pump
• Fits 2018-2025 Ford Transit-250, Alternator and Water Pump
• Fits 2015 Ford Transit-250, Alternator and Water Pump
• Fits 2018-2025 Ford Transit-350, Alternator and Water Pump
• Fits 2015 Ford Transit-350, Alternator and Water Pump
• Fits 2018-2025 Ford Transit-350 HD, Alternator and Water Pump
• Fits 2015 Ford Transit-350 HD, Alternator and Water Pump

Quality Assurance

Gates is a recognized name in accessory drive components, and the FleetRunner Heavy Duty line is built for service-focused replacement on commercial vehicles. Part number 90K-39221B is specified for the listed Ford Transit applications and is supported by Gates component identification for the belt and tensioner assembly.