Automatic Gearbox BMW F30 F31 335i F32 435i N55 GA8HP45 8638730 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 F30 F31 335i F32 435i N55 GA8HP45 is a factory-original, used automatic transmission designed for BMW models equipped with the N55 petrol engine. It offers precise, smooth gear shifts and a construction optimized for the high torque of the 335i and 435i units, which translates into stable drivetrain operation and comfortable driving. This is a solution for users who expect an original automatic transmission tailored to the specifics of the F30, F31, and F32 platforms.

Specifications and technical data

• SKU: 8638730
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 8638730
• Substitutable numbers: 8638730, 24008638730, 9487552, 24009487552, 8638257, 24008638257, 8684712, 24008684712, 8681083, 24008681083, 8486794, 24008486794, 8601205, 24008601205, 8614182, 24008614182, 8678709, 24008678709, 8623597, 24008623597
• Fuel type: Petrol
• Gearbox type: Automatic
• Category: Automatic Transmission

Purpose and compatibility with BMW models

The presented gearbox belongs to the Automatic Gearboxes category and has been designed to work with the N55 petrol engine in BMW 3 Series F30/F31 335i and 4 Series F32 435i models. The GA8HP45 design is optimized for the characteristics of turbocharged units, ensuring adequate durability and proper gear ratios for dynamic driving, while maintaining comfort in everyday use.

This type of automatic transmission is particularly valued in applications where consistent performance, quick response to load changes, and the ability to effectively utilize the power of a petrol engine are important. Thanks to its factory origin, full consistency with the original BMW drivetrain control systems is maintained.

Technical and functional characteristics

The GA8HP45 automatic transmission in the configuration for the N55 engine combines a multi-stage gearbox with an electronically controlled gear shifting system. The use of automatic control allows for:

• smooth gear shifting across the entire RPM range,
• effective utilization of the petrol engine's torque,
• stable acceleration without jerking,
• comfortable driving in both city traffic and on the highway.

Cooperation with the vehicle's electronic systems allows for integration with driving modes, traction control systems, and driver assistance functions. As a result, the gearbox behaves predictably and consistently with the factory BMW characteristics, which is important for both calm and more dynamic driving.

Drivetrain application and installation benefits

By installing this automatic transmission in a BMW F30, F31, or F32 with an N55 engine, you restore the proper operation of the entire drivetrain, eliminating typical signs of transmission wear, such as delayed gear shifts or uneven acceleration. The original design ensures:

• retention of factory gear shift points,
• proper cooperation with the engine control unit,
• consistency with factory safety and drivetrain protection parameters.

For the user, this means predictable vehicle behavior, reduced risk of incorrect adaptation, and the possibility of continued vehicle operation in accordance with the manufacturer's specifications. Choosing a used, original gearbox from this series is often more cost-effective than rebuilding a heavily worn transmission, while maintaining high manufacturing quality.

Condition, origin, and aspects of purchasing a used gearbox

The offered gearbox comes from the BMW OEM segment, which means it is a component compliant with the manufacturer's factory specifications. As a used part, it represents an attractive cost-saving solution for repairing or replacing a damaged transmission, allowing for reduced expenses while maintaining the original design. This is particularly important in the case of advanced automatic transmissions, where compatibility with vehicle electronics is of key importance.

If you want to better prepare for purchasing a transmission from the secondary market, it is worth reading the guide on typical faults and principles for selecting used transmissions: Gearbox: manual, automatic or DSG – typical faults and a guide to buying a used gearbox. You will find practical tips there on how to assess the condition of a gearbox and what to pay attention to during installation.

Additionally, if you are interested in the broader economic context of using secondary market components, the article Rising repair costs and the boom in used parts – how to save on car service? may be helpful, which discusses how to rationally use used OEM components in vehicle maintenance.

Expanding the BMW drivetrain – Automatic gearboxes

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 torque converters, control elements, or additional transmission components, check out the available parts in the BMW Automatic Gearboxes category.