Audi S5 8T 4.2 FSI Quattro Rear Differential Diff 43:13 MKV 0BF500043R WARRANTY

Listing details

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

Audi S5 8T 4.2 FSI Quattro Rear Differential Diff 43:13 is an original drivetrain component from the Differentials category, designed for installation on the rear axle of the Audi S5 8T model with Quattro all-wheel drive. The precise 43:13 gear ratio ensures consistent torque transfer to the rear axle, which translates into stable handling and predictable vehicle behavior during dynamic driving.

Specifications and technical data

• SKU: 0BF500043R
• Mark: Audi
• Condition: Used
• OEM Part Number: 0BF500043R
• Substitutable numbers: 0BF500043R, 0BF 500 043 R
• Location on the vehicle: Rear
• Category: Differentials

Purpose and function in the drivetrain

The presented rear differential is a key element of the drivetrain in the sporty Audi S5 8T with a 4.2 FSI engine and Quattro drive. It is responsible for distributing torque to the rear axle wheels, maintaining the correct gear ratio, and ensuring the stable operation of the entire drivetrain during acceleration, engine braking, and high-speed driving.

Its location on the vehicle is the rear axle, which means it works directly with the axle shafts and the rear suspension. The applied 43:13 gear ratio is characteristic of the 4.2 FSI Quattro configuration, ensuring the differential remains consistent with the factory drive characteristics and vehicle electronics.

Benefits of using an original differential

Choosing an original rear differential for the Audi S5 8T offers a number of practical technical benefits:

• preservation of the factory gear ratio, which facilitates compatibility with the existing transmission and Quattro system,
• correct geometry of mounts and flanges, promoting trouble-free installation,
• consistency with factory drivetrain operating parameters,
• reduced risk of malfunction in driver assistance systems.

This component is particularly important for repairs following mechanical damage, replacing a worn-out differential, or restoring full drivetrain efficiency in vehicles used in a dynamic manner.

Condition and practical application

The differential comes from dismantling and is offered as a used drivetrain component. This type of part is a popular choice for repairs where maintaining the original vehicle specification while optimizing costs is a priority. In practice, it performs well both in standard operation and in vehicles driven more dynamically, where predictable rear axle performance is essential.

Due to the specific gear ratio and fitment for the 4.2 FSI Quattro version, the differential is especially recommended when replacing a component with an identical configuration, without interfering with other drivetrain sub-assemblies.

Gear ratio selection and vehicle compatibility

The 43:13 gear ratio has a direct impact on acceleration characteristics, engine RPM at a given speed, and interaction with other drivetrain components. When selecting a rear differential for an Audi S5 8T, it is worth paying attention to:

• gear ratio compatibility with the vehicle's factory configuration,
• consistency with the installed transmission and Quattro drive,
• intended use of the car (daily driving, dynamic driving, occasional track use).

To better understand the impact of gear ratios on vehicle behavior and to consciously choose a differential for your driving style, check out our guide: Dismantled drive axles and differentials – how to choose gear ratios for your driving style.

Expanding the Audi drivetrain

If you are planning a comprehensive repair or upgrade of the drivetrain area in your Audi and need other elements from the same group, such as additional differentials, drive axles, or related rear axle components, check out the available parts in the Audi Differentials category.