Audi Q5 8R 2.0 TDI Quattro Rear Axle Differential LLU 42:9 0BD500043K WARRANTY

Listing details

The gearboxes are sold with a 90-day warranty! They were tested before removal and are in full working order.

Audi Q5 8R 2.0 TDI Quattro Rear Axle Differential is an original drivetrain component from the Differentials category, designed for all-wheel drive systems. This used rear axle with an LLU 42:9 gear ratio ensures proper torque distribution to the rear axle, maintaining the stability and predictable handling characteristic of Audi vehicles. This solution is dedicated to versions with a diesel engine and an automatic transmission, allowing for a technically correct repair of the drivetrain.

Specifications and technical data

• SKU: 0BD500043K
• Mark: Audi
• Condition: Used
• OEM Part Number: 0BD500043K
• Substitutable numbers: 0BD500043K, 0BD 500 043 K
• Location on the vehicle: Rear
• Fuel type: Diesel
• Gearbox type: Automatic
• Category: Differentials

Purpose and compatibility

The presented rear differential is designed for installation on the rear axle of the Audi Q5 8R model with Quattro drive, in versions equipped with a diesel engine and an automatic transmission. The axle construction is adapted to the torque characteristics of the diesel unit, which translates into stable acceleration, correct operation of traction systems, and predictable vehicle behavior in road conditions with varying grip.

The selection of the LLU 42:9 gear ratio is crucial for compatibility with the factory vehicle configuration – it affects engine RPM at a given speed, automatic transmission operation, and the correct functioning of electronic systems responsible for the all-wheel drive.

Construction and operating parameters

The rear drive axle in the Audi Q5 8R Quattro is responsible for transferring torque from the driveshaft to the rear half-shafts, while simultaneously compensating for the difference in wheel rotational speeds when cornering. The applied 42:9 gear ratio is optimized for the diesel unit, providing a balance between dynamics and fuel economy.

The differential works with an automatic transmission, so its characteristics have been selected to maintain smooth gear shifting, proper operation of driving modes, and consistency with the factory drive control software. The used component allows for restoring the original drivetrain operating characteristics without the need for structural modifications.

Practical application and benefits of installation

Installation of this differential is particularly recommended in the event of mechanical damage to the rear axle, improper operation of the Quattro drive, or the need to restore the factory gear ratio after previous, unsuccessful modifications. Using an original component with the correct gear ratio:

• restores proper cooperation with the automatic transmission,
• ensures consistency with factory drive controller settings,
• stabilizes vehicle behavior at higher speeds,
• reduces the risk of excessive wear on tires and drivetrain components.

For users expecting predictable, comfortable operation, using the correct differential is one of the key elements in maintaining the vehicle in accordance with factory specifications.

Condition, origin, and technical aspect

The offered differential is a used component, which in practice means the possibility of obtaining a factory-grade construction at a more favorable price than in the case of new parts. For workshops specializing in 4x4 drivetrain repairs and for informed Audi users, this represents a reasonable compromise between cost and maintaining the original geometry and rear axle gear ratio.

Manufacturer markings and replacement numbers are available in the technical specifications section, which facilitates verification of compatibility with a specific vehicle configuration before installation. This allows for precise matching of the differential to a given Audi Q5 8R unit, minimizing the risk of improper fitment.

Technical support and additional materials

For those who want to better understand gear ratio selection and the impact of the drive axle on driving characteristics, the following guide will be useful: Dismantled drive axles and differentials – how to choose gear ratios for your driving style. The article discusses definitions, principles of gear selection, compatibility with specific models, and practical examples of using used and refurbished components.

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, final drives, or other differentials, check the available parts in the Audi Differentials category.