Mini Cooper One F55 F56 F57 B38C Automatic Gearbox Twin Clutch 7DCT300 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 One F55 F56 F57 B38C Automatic Gearbox Twin Clutch 7DCT300 is a factory-original, used transmission from the Automatic gearboxes family, designed for Mini models with the B38C engine. The 7DCT dual-clutch design ensures smooth, dynamic gear shifts and high operational refinement of the drivetrain.

Specifications and technical data

• SKU: 9452803
• Mark: Mini (Genuine OE)
• Condition: Used
• OEM Part Number: 9452803
• Substitutable numbers: 28009454403, 9454403, 28009454503, 28009452803, 28009468703, 28009425903, 9454503, 9452803, 9468703, 9425903
• Gearbox type: Automatic
• Category: Automatic Transmission

Technical specifications and intended use

The presented automatic transmission has been designed specifically for compatibility with the B38C unit in Mini Cooper One F55, F56, and F57 models. The 7DCT dual-clutch system used is a modern solution that combines the comfort of a classic automatic transmission with the fast, precise gear shifting typical of sports-oriented designs.

The Automatic type ensures full integration with the vehicle's factory control systems, driving modes, and driver assistance systems. The gearbox is adapted to work with original Mini software, which facilitates configuration and reduces the risk of electronic compatibility issues.

Benefits of using an original Mini automatic transmission

Choosing an original Mini automatic transmission primarily ensures the consistency of the entire drivetrain. The factory transmission:

• maintains the correct acceleration and flexibility characteristics of the B38C engine,
• ensures proper cooperation with the factory engine control unit and safety systems,
• reduces the risk of vibrations, jerking, and incorrect gear shifts.

As a result, the car maintains predictable, repeatable road behavior, and the driver enjoys comfortable and stable drivetrain performance in daily use.

Professional installation and component selection

The 7DCT300 automatic transmission requires precise installation and proper electronic configuration. Installation in a specialized workshop equipped with appropriate diagnostic software and experience in working with Mini dual-clutch transmissions is recommended. Proper system bleeding, selection of the correct transmission fluid, and performing the gearbox adaptation are crucial for its durability.

Before purchasing, it is worth verifying the compatibility of the gearbox with the specific vehicle equipment version, model year, and the installed control unit. Proper selection of the component helps avoid issues with CAN bus communication and errors in the automatic gear shifting system.

Mini automatic transmissions – expansion and modernization

If you are planning a comprehensive repair or upgrade of the drivetrain area in your Mini and need other components from the same group, such as converters, control modules, or additional transmission sub-assemblies, check the available parts in the Mini automatic transmissions category.

Technical knowledge and selecting a used gearbox

When choosing a used transmission, it is worth knowing the typical signs of wear and the differences between replacing with an original component versus regeneration. A resource describing the cost-effectiveness of purchasing factory-used gearboxes compared to the repair process may be helpful – more information can be found in the article Manual gearbox failures – why an original used part is often more reasonable than regeneration, which covers general issues related to the costs and durability of transmissions.

If you are interested in a broader context of selecting original used components for popular car models, it is also worth reading the guide Best used car parts – a guide to the most frequently chosen original parts, which helps in consciously planning vehicle repairs and upgrades.

Summary

Mini Cooper One F55 F56 F57 B38C Automatic Gearbox Twin Clutch 7DCT300 is a technically advanced, original automatic transmission designed to work with the B38C engine in Mini models. Using this gearbox allows for maintaining factory drivetrain performance parameters, high gear-shifting refinement, and full integration with the vehicle's electronic systems, making it a rational choice for professional repair or modernization of the drivetrain.