Audi A4 B8 2.0 TDI Quattro Rear Differential Diff 37:10 JKP 0BC500043 WARRANTY

Listing details

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

Audi A4 B8 2.0 TDI Quattro Rear Differential Diff 37:10 JKP is an original drivetrain component from the Differentials category, designed for installation on the rear axle in quattro all-wheel-drive systems. It enables the transfer of torque to the rear wheels while maintaining the correct 37:10 gear ratio, which is crucial for the proper operation of the entire drivetrain. This solution is dedicated to users who expect factory compatibility and stable performance parameters.

Specifications and technical data

• SKU: 0BC500043
• Mark: Audi
• Condition: Used
• OEM Part Number: 0BC500043
• Substitutable numbers: 0BC500043, 0BC 500 043
• Location on the vehicle: Rear
• Category: Differentials

Purpose and function in the drivetrain

The rear differential in the Audi A4 B8 2.0 TDI Quattro is responsible for distributing torque between the rear wheels and working in conjunction with the central all-wheel-drive system. The 37:10 gear ratio is matched to the characteristics of the 2.0 TDI engine and the transmission, ensuring proper dynamics, engine RPM during highway driving, and predictable vehicle behavior in corners. Its location at the rear of the vehicle allows for direct integration with the half-shafts and suspension components of the driven axle.

Construction and key technical features

The presented differential is a complete rear axle assembly in terms of the differential mechanism, adapted for use with the Audi quattro system. The design is based on a bevel gear with a specific ratio, which ensures repeatable performance parameters and compliance with factory controller settings. Using an original unit from the Audi group allows you to maintain:

• the correct gear ratio in relation to the transmission and wheel diameter,
• stable operation of assistance systems (ABS, ESP, traction control),
• consistency of the all-wheel-drive characteristics across the entire speed range.

As a result, the differential maintains proper geometry and cooperation with other rear drivetrain components, which translates into predictable vehicle handling.

Practical application and benefits of installation

Installing a rear differential with a 37:10 ratio in an Audi A4 B8 2.0 TDI Quattro is particularly important when replacing a damaged axle, addressing noises from the rear drivetrain, or resolving improper quattro system operation. Using the correct component allows you to:

• restore proper power transmission to the rear axle,
• minimize the risk of overloading the transmission and drive shafts,
• maintain factory acceleration and engine RPM parameters,
• ensure consistent operation of safety and electronic stability control systems.

This solution is recommended both for standard daily use and for more dynamic driving styles, where even load distribution in the drivetrain is significant for component durability.

Condition, origin, and fitment

The offered rear differential is a used part, sourced from a dismantled Audi vehicle. This ensures full structural compatibility with the factory drivetrain, and installation is performed in a manner consistent with the manufacturer's service procedures. Proper fitment for a specific version of the Audi A4 B8 2.0 TDI Quattro requires verification of the gear ratio and drivetrain configuration to avoid discrepancies in transmission and drivetrain controller operation.

Technical support and gear ratio selection

Selecting the right axle and differential for your driving style and drivetrain configuration has a direct impact on dynamics, fuel consumption, and component longevity. If you want to better understand the relationship between axle ratios, engine characteristics, and driving comfort, it is worth checking out our guide: Dismantled drive axles and differentials – how to choose gear ratios for your driving style. The article discusses practical examples, definitions, and the most frequently asked questions related to replacing and selecting differentials.

If you are planning a comprehensive repair or upgrade of the drivetrain in your Audi and need other components from the same group, such as rear axles, differential mechanisms, or complete transmission assemblies, check out the available parts in the Audi Differentials category.