Audi A4 B8 3.2 FSI Quattro Rear Differential Diff 35:8 KLL 0BC500043M 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 3.2 FSI Quattro Rear Differential Diff 35:8 KLL is an original drivetrain component from the Differentials category, designed for installation on the rear axle. It ensures proper torque transfer in the quattro all-wheel-drive system, maintaining factory performance characteristics and a 35:8 gear ratio.

Specifications and technical data

• SKU: 0BC500043M
• Mark: Audi
• Condition: Used
• OEM Part Number: 0BC500043M
• Substitutable numbers: 0BC500043M, 0BC 500 043 M
• Location on the vehicle: Rear
• Category: Differentials

Purpose and function in the drivetrain

The presented rear differential is dedicated to the Audi drivetrain with a 3.2 FSI engine and quattro system, where it is responsible for distributing torque to the rear wheels. The 35:8 gear ratio allows for maintaining factory acceleration parameters, engine RPM, and transmission operating characteristics.

This component works in conjunction with the central drivetrain system, stabilizing the entire powertrain during acceleration, engine braking, and cornering. As a result, the vehicle maintains predictable handling and proper traction in typical road conditions.

Construction and technical characteristics

The rear differential is a complete rear axle assembly, integrating the final drive with a specific gear ratio and the differential mechanism. The design was engineered by the manufacturer for all-wheel-drive operation, with an emphasis on stability, durability, and consistent performance.

Its placement on the rear axle allows for a direct connection to the driveshaft and half-shafts, which minimizes energy loss and ensures compatibility with the factory suspension system. This solution is beneficial for both driving dynamics and acoustic comfort.

Benefits of using an original differential

Using an original Audi A4 B8 3.2 FSI Quattro Rear Differential Diff 35:8 KLL ensures compliance with the manufacturer's original specifications. The correct final drive ratio reduces the risk of improper interaction with the existing transmission and vehicle electronics.

The main advantages of this solution include:

• Gear ratio consistency with other drivetrain components.
• Stable torque transfer to the rear axle in the quattro system.
• Reduction of vibrations and unwanted noise resulting from component mismatch.
• Maintaining predictable vehicle behavior in various road conditions.

Condition, fitment, and service application

The offered item is a removed part and is classified as a used original component, which in practice means it retains its factory geometry, mounting points, and operating characteristics. This type of part is particularly useful for repairs following mechanical damage, replacing a worn-out differential, or restoring full drivetrain functionality.

Before installation, standard workshop verification is recommended, including checking for leaks, operational backlash, and the condition of the lubricant, to ensure long-term and stable operation in daily driving.

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

To better select the differential ratio for the car's character and your driving style, it is worth using the practical tips included in the article Dismantled drive axles and differentials – how to choose ratios for your driving style, which discusses the relationships between gear ratios, vehicle dynamics, and component durability.