Mini Cooper S F55 F56 F57 B46C B48C Twin Clutch Gearbox 7DCT300 9454406 WARRANTY

Listing details

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

Mini Cooper S F55 F56 F57 B46C B48C Twin Clutch Gearbox 7DCT300 is an advanced dual-clutch transmission from the Automatic transmissions category, designed for modern Mini Cooper S versions with B46C and B48C engines. This type of used automatic transmission allows for the efficient replacement of a damaged drivetrain unit while maintaining the vehicle's factory performance characteristics and dynamic capabilities.

Specifications and technical data

• SKU: 9454406
• Mark: Mini (Genuine OE)
• Condition: Used
• OEM Part Number: 9454406
• Substitutable numbers: 9454406, 28009454406, 9468606, 28009468606, 9452806, 28009452806, 9488506, 28009488506, 9454506, 28009454506, 9468706, 28009468706, 8489906, 28008489906
• Gearbox type: Automatic
• Category: Automatic Transmission

7DCT300 transmission technical specifications

The presented transmission belongs to a group of modern Automatic gearboxes based on dual-clutch technology. This solution ensures fast, smooth gear shifts while maintaining high torque transfer efficiency. The 7DCT300 design was developed specifically for B46C and B48C units, which translates into seamless integration with the vehicle's electronics and the Mini Cooper S F55, F56, and F57 drivetrain.

The dual-clutch architecture of the transmission allows for the parallel preparation of the next gear, which minimizes power delivery interruptions to the wheels. In practice, the driver receives dynamic throttle response, stable acceleration, and comfortable operation in both city traffic and on the highway.

Application in Mini Cooper S F55, F56, F57

Mini Cooper S F55, F56, and F57 models with B46C/B48C engines require a transmission designed specifically for their torque characteristics and control maps. The described 7DCT300 transmission is intended for use with these specific units, facilitating integration with factory controls, safety systems, and driving modes.

Replacing a damaged transmission with a used unit from the same family allows you to maintain:

• consistency with the original engine and transmission control unit software,
• the acceleration dynamics characteristic of the Mini Cooper S,
• predictable vehicle behavior in both automatic and sequential modes.

Benefits of installing a used automatic transmission

Choosing a used 7DCT300 family transmission for a Mini Cooper S is a solution that significantly reduces repair costs compared to purchasing a brand-new gearbox. At the same time, the original drivetrain design is preserved, which is important for both durability and future service diagnostics.

A used automatic transmission of this type is particularly attractive in situations where:

• a serious mechanical failure or housing damage has occurred,
• rebuilding the existing transmission is not economically justified,
• repair time and the ability to quickly return the vehicle to the road are priorities.

An additional value is the ability to maintain the factory gear-shifting character without the need to adapt aftermarket solutions with different specifications.

Selection and compatibility – what to look for

For a successful installation, it is crucial to match the transmission to the specific body version and engine of the Mini Cooper S. In practice, this means verifying compatibility with B46C/B48C units and the F55, F56, or F57 generation. It is also worth checking for compatibility with the existing wiring harness, control unit, and associated equipment.

Before purchasing, it is recommended to consult with a mechanic or a specialized service center that can confirm the installation feasibility for your specific vehicle and plan the adaptation and potential calibration procedure after installation.

Technical support and additional information

If you are considering a transmission replacement in your Mini and want to better understand when purchasing a used gearbox makes sense, what the differences are between manual and automatic transmissions, and how to evaluate the cost-effectiveness of a rebuild, the following article will be helpful: Used transmission – when is it worth it and what you need to remember.

If you are planning a comprehensive repair or upgrade of your Mini's drivetrain and need other components from the same group, such as transmissions with different gear ratios, variants with different controls, or additional sub-assemblies that work with the transmission, check out the available parts in the Mini automatic transmissions category.