Driveshaft BMW F20 F30 LCI B48 Rear Axle Output Shaft Right O/S D=27,6mm 8634242

Driveshaft BMW F20 F30 LCI B48 Rear Axle Output Shaft Right O/S D=27,6mm is an original drivetrain component from the Driveshafts group, designed for installation on the rear right side of BMW vehicles equipped with the B48 engine. This used OEM part ensures proper geometry, appropriate torsional rigidity, and compatibility with the factory suspension and final drive.

Specifications and technical data

• SKU: 8634242
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 8634242
• Substitutable numbers: 8634242, 33208634242
• Location on the vehicle: Rear, Right
• Category: Driveshafts

Purpose and function in the drivetrain

The described rear right driveshaft operates within the drive axle, transferring torque from the differential to the wheel. Its precisely selected length and construction allow for the proper operation of the multi-link suspension and maintain handling stability, both in daily use and during dynamic driving.

Thanks to the factory design, proper interaction with the wheel hub, differential, and suspension components is maintained, which reduces vibration, noise, and uneven tire wear. This is a key component for smooth acceleration, effective power transfer, and maintaining traction in rear-wheel-drive BMWs.

Construction and fitment for BMW F20 / F30 LCI / F32 B48

The driveshaft has been designed specifically for the BMW F-series platform with the B48 unit, taking into account the torque characteristics of this engine. Vehicle placement: rear – right side guarantees a proper fit with the original differential and hub, without the need for modifications or adaptations.

Its factory origin means that appropriate dimensional tolerances are maintained, which translates into correct spline seating, proper joint operation, and a stable connection with the chassis components. This is especially important in higher-power vehicles where the drivetrain is subjected to intense loads.

Benefits of using an original BMW driveshaft

• Structural compatibility – an OEM part matched to a specific BMW generation, with no risk of installation issues.
• Stable torque transfer – proper rigidity and geometry reduce slippage and unwanted vibrations.
• Consistency with factory suspension – maintaining the rear axle kinematics designed by the manufacturer.
• Suitability for repairs and single-side replacements – replacing only the damaged driveshaft on the right side of the rear axle.

Use in drivetrain repairs and diagnostics

This component is particularly useful for mechanical damage to the rear axle, such as play in the joints, knocking sounds when starting, vibrations during acceleration, or consequences of collisions within the suspension area. Replacing the driveshaft with an original component allows for restoring the proper operation of the drivetrain without interfering with the construction of the final drive or differential.

Combined with proper suspension and final drive diagnostics, this can effectively eliminate many common symptoms of wear in rear-wheel-drive BMWs, preserving factory driving characteristics and predictable vehicle behavior at the limit of grip.

If you are planning a comprehensive repair or upgrade of the rear axle drivetrain area in your BMW and need other elements from the same group, such as additional driveshafts, connecting shafts, or components interacting with the differential, check the available parts in the BMW Driveshafts category.

Technical support and component selection

When selecting a driveshaft for a specific body version and drivetrain configuration (different power variants, final drive ratios, equipment), it is crucial to compare the parameters with the existing element and the manufacturer's documentation. Proper selection reduces the risk of joint overload, leaks, and improper operation of stability control systems.

To better understand the relationships between the driveshaft, final drive, and differential, as well as the impact of gear ratios on driving characteristics, it is worth reading the article Dismantled final drives and differentials – how to choose gear ratios for your driving style, which discusses practical aspects of drivetrain configuration in passenger cars.

For users considering performance modifications or changing the car's characteristics using aftermarket components, the guide Tuning with used parts – how to gain performance without spending a fortune may also be helpful, describing a safe approach to tuning using dismantled components.