Audi RS4 B8 4.2 FSI CFSA Quattro Rear Differential 35:8 MKW 0BF500044 WARRANTY

Listing details

The differential is sold with a 90-day warranty! It was tested before removal and is in full working order.

Audi RS4 B8 4.2 FSI CFSA Quattro Rear Differential 35:8 MKW is an original drivetrain component from the Differentials group, designed for installation on the rear axle of the quattro drive system. It ensures precise torque transfer to the wheels, stable handling, and predictable vehicle behavior during dynamic driving.

Specifications and technical data

• SKU: 0BF500044
• Mark: Audi
• Condition: Used
• OEM Part Number: 0BF500044
• Substitutable numbers: 0BF500044, 0BF 500 044
• Location on the vehicle: Rear
• Category: Differentials

Purpose and function in the drivetrain

The presented rear differential is a key element of the quattro drive distribution system, responsible for differentiating wheel rotational speeds and effectively transferring the V8 engine power to the rear axle. Its placement at the rear of the vehicle allows for maintaining proper traction, especially at higher speeds and in corners, which is significant both in daily use and during more dynamic driving.

The 35:8 MKW gear ratio configuration promotes a harmonious balance between performance and driving comfort, influencing acceleration characteristics and the overall refinement of the drivetrain. Thanks to this, the differential fits well with the sporty character of the RS4 B8 version while maintaining an appropriate reserve of durability.

Benefits of using an original rear differential

Using an original rear differential in the Audi RS4 B8 4.2 FSI Quattro allows you to maintain the factory handling and stability parameters of the vehicle. This component was designed for a specific drive configuration, which translates into:

• consistent operation with other quattro system components,
• properly selected gear ratio characteristics relative to engine power and torque,
• predictable vehicle behavior during load and traction changes,
• maintaining the correct geometry and operation of the rear axle.

For users who expect repeatable throttle response and stability at higher speeds from their RS4, using the correct rear differential is one of the key elements in maintaining full drivetrain functionality.

Condition, fitment, and installation aspects

The differential comes from dismantling and is offered as a used original part, which allows for combining a cost-effective purchase with the preservation of factory specifications. This type of component is particularly attractive for post-accident repairs, replacing a worn-out rear axle, or restoring a car to its factory-compliant configuration.

Its placement on the rear axle facilitates work for workshops familiar with the Audi RS4 B8 design – installation is carried out in the location intended by the manufacturer, without the need for modifications to the body structure or suspension. In practice, this means the possibility of efficient replacement as part of standard service procedures, while maintaining proper cooperation with the driveshaft and half-shafts.

Gear ratio selection and compatibility with the car's character

The 35:8 MKW gear ratio has a significant impact on how the car reacts to the throttle, how it maintains RPMs during highway driving, and how it behaves during acceleration in higher gears. Proper selection of the rear differential for a specific engine and transmission version allows for avoiding undesirable effects, such as excessive drivetrain load or changes in engine operating characteristics.

If you want to understand in more detail how the axle gear ratio affects driving style, it is worth checking out our guide: Dismantled drive axles and differentials – how to choose gear ratios for your driving style. You will find practical tips on interpreting gear ratios, component compatibility, and examples of applications in various configurations.

Audi differentials – expansion and drivetrain modernization

If you are planning a comprehensive repair or modernization of the drivetrain in your Audi and need other elements from the same group, such as additional axles, front differentials, or components cooperating with the transmission system, check out the available parts in the Audi Differentials category.

Choosing original used components from dismantling can also be beneficial from an environmental perspective and for rational resource management. If you are interested in the ecological aspect of such solutions, read the article Sustainable automotive: How buying original used parts reduces your carbon footprint and protects the environment?, which discusses the impact of reusing parts on reducing emissions and raw material consumption.

Summary

Audi RS4 B8 4.2 FSI CFSA Quattro Rear Differential 35:8 MKW is a technically matched, original rear drivetrain component that allows for restoring the proper operation of the quattro drive and maintaining factory driving characteristics. For RS4 B8 owners, it represents a practical solution for repairs and modernizations, combining structural compatibility with predictable vehicle behavior on the road.