Gates 90K-39456 Serpentine Belt Drive Component Kit - Air Conditioning and Power Steering or Alternator and Air Conditioning

Heavy Duty Serpentine Service Kit

Gates FleetRunner Heavy Duty Serpentine Kits simplify accessory drive service with a single part number for the belt and tensioner. This kit is built for fleet maintenance on Ford Transit applications, helping restore proper belt routing and tension control in one service.

For 2020-2025 Ford Transit, Transit-150, Transit-250, Transit-350, and Transit-350 HD models, this heavy duty accessory belt drive kit supports air conditioning, power steering, alternator, and air conditioning configurations depending on model year. The Gates 90K-39456 kit is sized with a 57.625-inch outside circumference and a 14 mm belt top width.

Key Features

• Gates FleetRunner Heavy Duty accessory belt drive kit
• Includes belt and tensioner for complete serpentine system service
• Belt part number K040570HD
• Tensioner assembly part number 39456
• Outside circumference: 1464 mm / 57.625 in
• Belt top width: 14 mm / .56 in
• Engineered for Ford Transit fleet maintenance applications

Product Details

The Gates FleetRunner Heavy Duty line is focused on simplifying serpentine system maintenance with matched components in one package. Gates 90K-39456 is intended for Ford Transit platform service where belt wear, tension loss, or accessory drive noise can affect operation. By combining the belt and tensioner in one kit, it supports a more efficient repair process for Transit vans used in commercial and fleet duty cycles.

This part cross-references Gates 90K-39456 for the same application.

What It Helps Address

• Squealing or chirping from the accessory drive belt
• Loss of belt tension from a worn tensioner assembly
• Cracking, glazing, or wear on the serpentine belt
• Accessory drive noise affecting Ford Transit service intervals
• Repeated belt service on high-use fleet vehicles

Installation Notes

• Verify engine accessory drive routing before installation.
• Confirm the vehicle year, model, and accessory configuration against the fitment list.
• Inspect pulleys and related drive components for wear before installing the new belt and tensioner.
• Use the listed belt dimensions and part numbers to confirm correct application.

Quality Assurance

Gates FleetRunner Heavy Duty kits are built for proper serpentine system service and reflect Gates’ heavy duty maintenance experience across fleet applications. The kit is designed to address known accessory drive issues found in long-term service histories on Ford Transit vehicles.