Audi A6 C6 4F 3.0 TDI Quattro Automatic Gearbox 6 Speed KJC 09L300040TX WARRANTY

Listing details

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

Audi A6 C6 4F 3.0 TDI Quattro Automatic Gearbox 6 Speed KJC is a factory-original, used automatic transmission designed for diesel engines and specifically engineered for the Quattro drivetrain. Thanks to its OEM construction, it ensures consistent operation with the drivetrain and vehicle electronics, resulting in predictable performance and comfortable gear shifts. This is a solution for users seeking a technically matched component rather than universal replacements.

Specifications and technical data

• SKU: 09L300040TX-1
• Mark: Audi
• Condition: Used
• OEM Part Number: 09L300040TX
• Substitutable numbers: 09L300040TX, 09L 300 040 TX
• Fuel type: Diesel
• Gearbox type: Automatic
• Category: Automatic Transmission

Purpose and technical characteristics

The presented transmission belongs to the Automatic gearboxes category and has been developed to work with diesel engines in the Quattro drivetrain system. Automatic gear control ensures smooth acceleration, stable RPM maintenance, and predictable throttle response, which is particularly important in premium class vehicles such as the Audi A6 C6 4F.

Being dedicated to a specific model configuration limits the risk of mechanical and electronic compatibility issues. Properly selected gear ratios and operating characteristics under the load of a diesel engine promote calm, economical highway driving and confident acceleration in urban conditions.

Application in the Audi A6 C6 4F 3.0 TDI Quattro drivetrain

The automatic transmission in this model is responsible for:

• transferring torque from the diesel engine to the Quattro drivetrain,
• automatic gear shifting based on load and driving style,
• cooperation with safety and comfort systems (e.g., traction control, drive modes – if present in the specific vehicle configuration),
• maintaining appropriate engine RPM to reduce fuel consumption and noise.

Thanks to its factory origin, the transmission is structurally prepared to work with all-wheel drive, which is significant for the durability of internal components and the correct distribution of torque between the axles.

Benefits of choosing a used automatic transmission

Choosing a used automatic transmission for an Audi allows for significant repair cost savings compared to purchasing a new component, while maintaining the original design. For many users, this is a reasonable compromise between budget and preserving the vehicle's factory specifications.

The main advantages of this solution include:

• retaining the original shifting characteristics intended by the manufacturer,
• the possibility of direct installation in place of the damaged unit (after verifying compatibility),
• better integration with vehicle electronics than many aftermarket replacements.

Before installation, a standard workshop procedure is recommended: checking for leaks, verifying transmission fluid levels, and performing a transmission adaptation using an appropriate diagnostic tool, if required for the specific unit.

Selection and verification of transmission compatibility

To correctly select a transmission for a specific Audi A6 C6 4F 3.0 TDI Quattro, it is worth paying attention to:

• fuel type compatibility (Diesel) with the engine in the car,
• transmission type (Automatic) and its integration with existing equipment,
• information contained in the vehicle's technical specifications and the transmission's identification data.

When purchasing a used transmission, it is advisable to consult with a mechanic or an automatic transmission specialist who can assess the requirements of the specific car configuration and advise on any necessary service steps after installation.

If you want to better understand the differences between manual, automatic, and DSG transmissions, typical failure symptoms, and key steps when buying a used gearbox, the following guide will be helpful: Manual, automatic, or DSG transmission – typical faults and a guide to buying a used gearbox.

Used parts for German cars – an informed choice

For brands like Audi, many users choose used drivetrain components to keep the car in good condition at reasonable service costs. However, it is worth knowing which parts are worth buying second-hand and when it is better to opt for other solutions. A broader discussion of this topic can be found in the article Renovation and repair of German cars: which used parts are worth buying and which are better to avoid?.

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 a torque converter, control elements, or additional transmission components, check the available parts in the Audi automatic transmissions category.