BMW F20 F21 F30 F31 LCI 120dX 320dX B47 Automatic Gearbox GA8HP50X FOR PARTS

BMW F20 F21 F30 F31 LCI 120dX 320dX B47 Automatic Gearbox GA8HP50X FOR PARTS is a drivetrain component designed for BMW xDrive models equipped with an automatic transmission. The internal structure of the GA8HP50X gearbox is engineered for precise interaction with diesel engines and all-wheel drive systems, ensuring stable operation and predictable drivetrain response. This is a solution for users who expect consistent performance, correct gear shifting characteristics, and compliance with factory BMW standards.

Specifications and technical data

• SKU: 9487620-1
• Mark: BMW (Genuine OE)
• OEM Part Number: 9487620
• Substitutable numbers: 24009487620, 9487620, 24008693345, 24008678683, 24009426281 24008486694, 24008673732, 8693345 8678683, 9426281, 8486694 8673732
• Gearbox type: Automatic
• Category: Other Transmission & Drivetrain

Purpose and technical specifications

The internal components of the GA8HP50X gearbox used in the BMW 1 Series F20 and 3 Series F30 in 120dX and 320dX versions are responsible for the proper management of torque within the automatic transmission. The design is optimized for compatibility with the xDrive system, which translates into even load distribution and stable vehicle behavior under various road conditions.

This element is part of a system that, in BMW vehicles, is responsible for:

• proper gear synchronization in the automatic transmission,
• maintaining correct gear shifting characteristics under various loads,
• preserving compliance with factory transmission control logic.

Compatibility with BMW models

The internal components of the GA8HP50X gearbox have been developed for specific BMW F20 and F30 drivetrain configurations, particularly the 120dX and 320dX versions. This ensures consistency with the factory drivetrain architecture, which minimizes the risk of fitment issues and reduces the need for additional modifications during installation.

The presence of dedicated part numbers and interchangeable numbers allows for precise identification of the component in BMW catalogs and facilitates the selection of the correct gearbox internals for a specific vehicle configuration. This is particularly important when working with all-wheel-drive vehicles, where tolerances and component fitment have a direct impact on the durability of the entire system.

Benefits of using the GA8HP50X gearbox internals

Using the GA8HP50X gearbox internals in a BMW F20/F30 120dX/320dX allows for maintaining transmission performance parameters close to factory specifications. In practice, this means:

• smooth and predictable gear shifts in automatic mode,
• proper cooperation with xDrive drivetrain control systems,
• reduction of vibrations and unwanted noises resulting from improper component fitment.

For workshops and users, this means the ability to perform repairs in a technically correct manner, without compromising the functionality of the drivetrain. Maintaining compliance with BMW solutions translates into stable operation and predictable vehicle behavior in daily use.

Professional use in service and remanufacturing

The GA8HP50X gearbox internals are often used in the professional repair or remanufacturing processes of automatic transmissions used in BMW vehicles. Thanks to the precise fit for the specific gearbox type, it is possible to restore the original operating parameters of the transmission without interfering with control logic or vehicle software.

In workshop practice, such a component allows for:

• precise rebuilding of the automatic transmission interior,
• reduction of diagnostic time related to part incompatibility,
• maintaining a high level of reliability after the repair is completed.

Expanding knowledge and selecting parts

If you are planning a comprehensive repair or upgrade of your BMW's drivetrain area and need other elements from the same group, such as transmission components, control elements, or sub-assemblies working with the xDrive system, check the available parts in the Other BMW category.

For users interested in comparing solutions used in different brands and vehicle segments, including sports versions of German manufacturers' models, an article discussing the differences in engine, brake, and chassis construction may be helpful. For this purpose, it is worth reading the material: Audi RS vs other models – what is hidden under the hood and chassis?.