Ford Focus St-2 Mk2 Driveshaft Front Right O/S RM4N51-3B436-X1K

Ford Focus St-2 Mk2 Driveshaft Front Right O/S is an original drivetrain component designed for installation on the driver's side of the front axle. Thanks to its factory geometry and precise fitment for the ST-2 version, it ensures stable torque transfer and predictable vehicle handling during dynamic driving. This is the ideal solution for users who expect consistency with Ford's factory design and wish to maintain the proper operating parameters of the drivetrain.

Specifications and technical data

• SKU: RM4N51-3B436-X1K
• Mark: Ford
• Condition: Used
• OEM Part Number: RM4N51-3B436-X1K
• Substitutable numbers: RM4N51-3B436-X1K, RM4N513B436X1K, 1798101
• Location on the vehicle: Front, Right
• Part type: Driveshaft
• Category: Driveshafts

Purpose and fitment for Ford Focus St-2 Mk2

The presented driveshaft has been designed specifically for the front axle on the right side of the second-generation Ford Focus ST-2. The correct vehicle placement ensures that the length, diameter, and mounting points comply with the factory requirements of this engine and drivetrain version. As a result, the component works seamlessly with the suspension and steering system without interfering with the body or steering knuckle construction.

Technical and functional characteristics

The driveshaft from this series belongs to the Driveshafts category, meaning it is responsible for transferring power from the transmission to the wheel hub while maintaining the necessary suspension flexibility. The design intended for front-right installation ensures:

• proper cooperation with the factory differential and wheel hub,
• maintenance of the drivetrain's alignment and geometry,
• appropriate torsional rigidity under loads typical for the ST-2 version,
• stable vehicle behavior during acceleration and engine braking.

By maintaining the original installation specifications, the driveshaft helps reduce vibrations and unwanted play, which translates into more precise vehicle handling and predictable throttle response.

Benefits of using an original Ford driveshaft

Choosing a component from the Ford brand primarily means compliance with factory quality standards and a perfect fit for the specific model version. In practice, this means:

• no modifications required during installation – original spacing and mounting types are preserved,
• consistency with factory drivetrain seals and covers,
• preservation of the front-wheel-drive operating characteristics intended by the manufacturer,
• easier diagnostics and future servicing thanks to compliance with Ford service documentation.

This component is particularly important in high-performance cars such as the Focus ST-2, where the drivetrain operates under higher loads than in standard versions.

Condition, origin, and practical application

The offered driveshaft is a used component, which allows for an economical repair of the drivetrain while maintaining the original Ford design. This is a good solution in situations where the existing driveshaft has suffered mechanical damage, joint wear, or deformation following a collision. Using an original component from disassembly allows for restoring proper drivetrain operation without the need to resort to aftermarket parts with uncertain specifications.

For proper selection, it is recommended to compare the vehicle placement and manufacturer markings with your vehicle's data. If in doubt, it is worth verifying compatibility with the specific equipment version and model year of the Focus ST-2 to avoid installation issues.

Expanding knowledge about the drivetrain and component selection

When replacing a driveshaft, it is worth understanding how the entire drivetrain works with the differential and drive axle, especially in sports-oriented cars. For drivers who want to better adjust their drivetrain configuration to their driving style, an article discussing gear ratios and component selection will be helpful – you can find it here: Used drive axles and differentials – how to choose gear ratios for your driving style.

If you are planning a comprehensive repair or upgrade of the drivetrain area in your Ford and need other elements from the same group, such as additional shafts, half-shafts, or compatible joints, check out the available parts in the Ford Driveshafts category.