Ford Transit MK8 2.2 TDCI Rear Axle Differential I=3.55 BK31-4001-CAL WARRANTY

Listing details

The differential is sold with a 90-day warranty! It was tested before removal and is in full working order. Ford Transit MK8 2.2 TDCI Rear Axle Differential I=3.55 is a factory-original drivetrain component designed for installation on the rear axle of Ford commercial vehicles. It is responsible for the precise distribution of torque to the wheels, ensuring stable handling, predictable vehicle behavior under load, and the correct final drive ratio. This solution is particularly beneficial for users who expect consistent traction parameters and proper integration with the stock drivetrain.

Specifications and technical data

• SKU: 2531024
• Mark: Ford
• Condition: Used
• OEM Part Number: 2531024
• Substitutable numbers: 2531024, NK314001CEA, NK31-4001-CEA, BK31-4001-CAL, BK314001CAL
• Location on the vehicle: Rear
• Part type: Differential & Housing Assembly
• Category: Differentials

Technical characteristics of the rear axle differential

The presented differential belongs to the Differentials category and is intended for rear-axle installation. The axle construction with an I=3.55 ratio is optimized for typical commercial applications – it combines reasonable acceleration with economical engine operation at cruising speeds. As a result, the drivetrain maintains stable RPMs, which promotes smooth, predictable operation in both urban and extra-urban traffic. The differential has been designed as a component that works with rear-wheel drive, taking into account the torque characteristics of the 2.2 TDCI unit. The properly selected axle ratio allows for the right balance between starting dynamics with a load and driving comfort at constant speeds, which is important both in local transport and on longer routes.

I=3.55 ratio and driving comfort and economy

In practice, the I=3.55 ratio represents a compromise between flexibility at low speeds and moderate engine RPMs when driving at a constant speed. In daily operation, this translates into:

• smoother starting and maneuvering with a load,
• stable vehicle behavior at highway speeds,
• reduction of excessive noise and engine RPMs,
• better predictability of the drivetrain in typical fleet conditions. For users who want to consciously select an axle for their driving style or the specific nature of their vehicle's work, it is helpful to explore the topic of gear ratios and compatibility. For this purpose, it is worth checking out our guide Dismantled drive axles and differentials – how to choose ratios for your driving style, where practical examples and the most common questions regarding differential selection are discussed.

Application in Ford Transit MK8 2.2 TDCI

The Rear Axle Differential I=3.55 has been developed with the specifics of a commercial vehicle in mind, which often operates under variable loads in a mixed city-highway cycle. The appropriate ratio characteristics support:

• maintaining traction when loaded on the rear axle,
• driving stability under changing road conditions,
• even torque distribution to both wheels,
• proper cooperation with the stock gearbox and drivetrain. By maintaining the factory design concept, installing this differential in a Ford Transit MK8 2.2 TDCI allows for the restoration of the original rear axle performance, which is essential for post-accident repairs, after axle failure, or when replacing a worn component with a proven equivalent.

Condition, origin, and benefits of choosing a used differential

The offered item is in used condition, which in practice means real cost savings while maintaining the original design and geometry of the drivetrain. For many fleet users and workshops specializing in commercial vehicle service, this is a sensible solution that allows for reduced expenses while maintaining compliance with the manufacturer's factory specifications. As a part of the drivetrain group, the differential is a key element for the durability of the entire system. Choosing an original solution dedicated to the Ford Transit MK8 minimizes the risk of issues with fitment, incorrect ratios, or incompatibility with other axle components.

Drivetrain expansion and selection of other Ford differentials

If you are planning a comprehensive repair or upgrade of the drivetrain area in your Ford and need other components from the same group, such as different axle variants, differentials with different ratios, or complete rear axle assemblies, check out the available parts in the Ford Differentials category.