Ford Transit Custom Rear Leaf Spring Left Right N/O/S 2.0 Diesel FK21-5560-AA

Ford Transit Custom Rear Leaf Spring Left Right N/O/S is an original suspension component designed for the 2.0 Diesel engine version, mounted on the left or right side of the rear axle. It belongs to the Leaf springs and coil springs category, providing stable body support, deflection control, and predictable vehicle behavior under load.

Specifications and technical data

• SKU: FK21-5560-AA
• Mark: Ford
• Condition: Used
• OEM Part Number: FK21-5560-AA
• Substitutable numbers: FK21-5560-AA, FK215560AA, 2359769, FK21-5560-AC, FK215560AC
• Location on the vehicle: Rear, Right, Left
• Fuel type: Diesel
• Category: Leaf & Coil Springs

Application and function in the suspension

The presented leaf spring operates in the rear part of the vehicle, on the left or right side, and is responsible for transferring loads from the body to the drive axle and wheels. In combination with shock absorbers, it stabilizes the suspension, reduces body roll, and improves vehicle control both when driving with a load and when empty.

The component has been designed specifically for diesel-powered systems, which means it is matched to the mass characteristics and load distribution of diesel engine versions. As a result, the suspension maintains proper geometry, and tires wear evenly.

Benefits of using an original leaf spring

Choosing an original rear leaf spring for the Ford Transit Custom translates into predictable vehicle behavior and compliance with factory parameters. A properly selected deflection characteristic helps maintain ride comfort while preserving load-bearing capacity, which is essential in commercial vehicles operating under variable load conditions.

The main advantages include:

• Stable vehicle handling when driving with and without a load.
• Better control over the rear axle during braking and when driving over bumps.
• Reduction of excessive body roll in corners.
• Maintaining the correct rear ride height of the vehicle relative to the ground.

Installation characteristics

The leaf spring is intended for installation on the rear axle on the right or left side, which facilitates part selection during suspension repairs. The design provided by the vehicle manufacturer allows for the use of standard mounting points without the need for frame or drive axle modifications.

During replacement, it is recommended to check other suspension components – bushings, mounts, bump stops, and shock absorbers – to restore full system efficiency. A properly selected and installed leaf spring minimizes the risk of incorrect wheel alignment, knocking, or excessive vibrations transmitted to the body.

Condition and purpose

The offered component is used, which makes it an attractive solution for maintenance repairs when the priority is to maintain the original suspension design at reasonable costs. It works well both when replacing a damaged leaf spring after a mechanical failure and during the gradual renovation of the rear axle in intensively used commercial vehicles.

Matching the leaf spring to the powertrain

The leaf spring is intended for use with a diesel-powered engine unit, which is important when selecting parts for a specific vehicle configuration. Diesel versions differ in mass and load distribution from gasoline variants, which is why using the correct suspension component is crucial for maintaining factory handling parameters and component durability.

When planning broader work on the drivetrain and rear suspension, it is also worth paying attention to the selection of axle ratios and differential characteristics. The guide article Dismantled drive axles and differentials – how to choose ratios for your driving style, which discusses practical aspects of drivetrain configuration, may be helpful.

If you are planning a comprehensive repair or upgrade of the rear suspension area in your Ford and need other components from the same group, such as additional leaf springs, coil springs, or mounting elements, check the available parts in the Ford leaf springs and coil springs category.