BMW F20 F30 F31 120d 320d N47N Automatic Auto Gearbox 8638271 GA8HP45 WARRANTY

Listing details

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

BMW F20 F30 F31 120d 320d N47N Automatic Auto Gearbox is an original drivetrain component designed for BMW models with the N47N engine and automatic transmission. Thanks to its factory design, it ensures proper cooperation with the vehicle's electronics and correct torque transfer in cars equipped with the GA8HP45 automatic transmission. This is a solution for users who expect consistency with the factory BMW specification when replacing a damaged gearbox.

Specifications and technical data

• SKU: 8638271
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 8638271
• Substitutable numbers: 24008638271, 8638271, 24009487556 24008486827, 24008685313 24008681097, 9487556 8486827, 8685313 8681097
• Gearbox type: Automatic
• Category: Gearboxes, Racks & Pinions

Application and compatibility

The presented automatic gearbox is intended for BMW 1 Series F20 and 3 Series F30 / F31 models in 120d and 320d versions with the N47N unit. The design of the GA8HP45 transmission has been developed to work with the drivetrain of these models, which allows for maintaining the correct gear shifting characteristics, driving mode logic, and integration with onboard systems.

By using an original component from the BMW group, it is possible to maintain factory performance parameters without the need to adapt aftermarket solutions. This is particularly important in vehicles with advanced control electronics, where proper communication between the gearbox and control modules affects driving comfort and safety.

Technical characteristics of the automatic transmission

The GA8HP45 automatic transmission belongs to modern torque converter gearboxes, where the priority is smooth gear shifting and efficient use of the diesel engine's torque. The applied design enables:

• precise gear selection depending on load and driving style,
• stable operation across the full RPM range,
• cooperation with comfort and dynamic modes, if available in the given vehicle.

As an item from the Steering gears and housings category, the automatic gearbox is a key component of the drivetrain, responsible for the proper transfer of engine power to the drive wheels and maintaining the appropriate operating culture of the entire powertrain.

Condition, origin, and benefits of installation

The offered gearbox is a used item, which allows for economical vehicle repair while maintaining the original BMW design. Choosing such a solution is beneficial in situations where repairing the existing transmission is unprofitable or technically difficult, and the priority remains to maintain compliance with the factory drivetrain design.

The main advantages of using an original automatic gearbox in this model include:

• maintaining factory gear shifting characteristics,
• consistency with the vehicle's control software,
• reducing the risk of compatibility issues compared to random replacements.

Additionally, the presence of the OEM part number and interchangeable numbers in the technical specification facilitates verifying compatibility with a specific vehicle version before installation.

Professional selection and technical support

To correctly select this automatic gearbox for your BMW, it is worth verifying the markings with the vehicle documentation and comparing them with the OEM data and reference numbers provided in the specification. This allows you to avoid compatibility issues, especially in the case of differences resulting from the production year, equipment version, or control software.

If you want to deepen your knowledge on the safe selection of aftermarket parts and avoid poor purchases, use the expert advice described in the article No more bad purchases! How to professionally select used car parts, saving time and nerves. You will find practical tips there regarding the analysis of OEM numbers and assessing the compatibility of parts with a specific car model.

Expanding work within the BMW drivetrain

If you are planning a comprehensive repair or modernization of the drivetrain area in your BMW and need other elements from the same group, such as gearbox housings, mounting elements, or additional components working with the steering column, check the available parts in the BMW steering gears and housings category.