Automatic Gearbox BMW F20 120d F30 320d F32 420d B47 8673730 GA8HP50 WARRANTY

Listing details

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

Automatic Gearbox BMW F20 120d F30 320d F32 420d B47 GA8HP50 is a factory-original automatic transmission designed for modern BMW B47 diesel engines. It offers smooth gear shifts, high operational refinement, and is perfectly matched to the characteristics of a diesel engine, resulting in a comfortable and predictable driving experience. By maintaining the original design, it represents a sensible choice for professional drivetrain repairs.

Specifications and technical data

• SKU: 8646689
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 8646689
• Substitutable numbers: 8673730, 24008646689, 8646689, 24009487619, 9487619, 24008627829, 8627829, 24008654236, 8654236, 24009426280, 9426280
• Fuel type: Diesel
• Gearbox type: Automatic
• Category: Automatic Transmission

Purpose and compatibility

The described automatic gearbox has been designed to work with B47 family diesel engines in the 1 Series F20, 3 Series F30, and 4 Series F32 models. The Automatic design ensures seamless integration with the vehicle's factory electronics, safety systems, and BMW drivetrain, facilitating easy installation and subsequent operation.

As an item in the Automatic gearboxes category, it is intended for use in vehicles where comfort, predictable throttle response, and stable torque transfer of the diesel unit are priorities.

Technical and design characteristics

The gearbox is based on the advanced GA8HP50 design, known for its efficient use of diesel engine torque and optimized performance under various loads. The applied automatic gear-shifting technology allows for:

• smooth acceleration without jerking,
• maintaining low RPMs when driving at a constant speed,
• better utilization of the diesel engine's characteristics.

Thanks to its factory origin, the gearbox maintains compatibility with original control maps and gear-shifting logic provided by BMW, which is essential for the durability of the entire drivetrain.

Application in diesel drivetrains

The transmission was developed to work with Diesel engines, where stable transfer of high torque at relatively low RPMs is key. The automatic operating characteristics support:

• calm city driving with smooth starts,
• dynamic acceleration on the highway,
• maintaining optimal gear ratios for fuel economy.

This matching translates into predictable vehicle behavior in various road conditions and reduces the risk of overloading drivetrain components.

Professional installation and part selection

As an original BMW component, the gearbox is adapted for installation at factory mounting points and for working with standard accompanying components. When selecting, it is worth paying attention to compatibility with the specific engine and equipment version of the vehicle, as well as the correct configuration of the controller in the vehicle after installation.

To facilitate identification, a dedicated OEM part number and associated interchangeable numbers have been used, which allows for precise matching of the gearbox to a specific car without the risk of error.

Condition and benefits of choosing an original used gearbox

The offered transmission comes from the used BMW automatic gearboxes segment, which allows for a significant reduction in repair costs compared to purchasing a new component. Maintaining the original design and operating parameters is particularly important in vehicles equipped with extensive electronic systems.

If you want to better understand when choosing an original used transmission is advantageous compared to remanufacturing, it is worth reading an article discussing the topic using manual gearboxes as an example: Manual gearbox failures – why an original used part is sometimes a more sensible choice than remanufacturing.

Expanding the scope of service work

If you are planning a comprehensive repair or upgrade of the drivetrain area in your BMW and need other elements from the same group, such as additional transmissions, control elements, or related modules, check out the available parts in the BMW automatic gearboxes category.