Automatic Gearbox BMW F20 M135i F22 M235i F13 640i N55 GA8HP45Z 8623599 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 M135i F22 M235i F13 640i N55 GA8HP45Z is an advanced, eight-speed automatic transmission designed for BMW N55 family petrol engines. It is a precisely matched drivetrain component that ensures smooth gear shifting and stable operation of the power unit under a wide range of loads. Thanks to its factory BMW design, the gearbox maintains full compatibility with the vehicle's original architecture and control electronics.

Specifications and technical data

• SKU: 8623599
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 8623599
• Substitutable numbers: 8623599, 24008623599, 9487554, 24009487554, 8486824, 24008486824, 8684716, 24008684716, 8678717, 24008678717, 8645366, 24008645366, 8601213, 24008601213, 8638262, 24008638262, 8601185, 24008601185, 8681088, 24008681088
• Fuel type: Petrol
• Gearbox type: Automatic
• Category: Automatic Transmission

Application and compatibility

The offered automatic transmission is designed for BMW 1 Series F20 M135i, 2 Series F22 M235i, and 6 Series F13 640i models with the N55 petrol engine. The gearbox construction has been developed for the high torque of these units, which translates into stable power transmission both in daily use and during dynamic driving. Automatic gearboxes of this type work with factory safety and comfort systems, such as traction control or driving modes, maintaining full vehicle functionality.

Technical characteristics and transmission operation

The automatic design of the gearbox provides sequential, multi-stage gear ratios, which allows for maintaining optimal petrol engine RPM in various road conditions. The applied transmission architecture allows for:

• smooth starting without jerking,
• efficient acceleration at higher speeds,
• effective utilization of the N55 engine characteristics,
• stable cooperation with the engine and drivetrain control system.

Thanks to this, the automatic gearbox in these BMW models ensures predictable throttle response, comfortable gear changes, and appropriate operating refinement in city traffic and on the highway.

Benefits of installing a used automatic gearbox

Choosing a used automatic transmission for a BMW with an N55 petrol engine is a solution that allows for reducing repair costs while maintaining the vehicle's original specifications. This type of component enables:

• preserving the factory fitment to the BMW drivetrain and electronics,
• restoring proper drivetrain operation without the need for costly regeneration of the old gearbox,
• maintaining the consistency of the vehicle configuration with service documentation.

A used gearbox from this series is particularly attractive for users who expect consistency with the original BMW design and predictable vehicle behavior after repair.

Selection, verification, and installation aspects

Before purchasing, it is recommended to verify the compatibility of the transmission with the specific equipment version and vehicle year, particularly regarding the petrol engine type and the automatic gearbox control system used. It is helpful to compare the gearbox identification data and consult with a mechanic specializing in the BMW brand. A correctly selected gearbox facilitates installation, limits the need for additional adaptations, and allows for efficient execution of programming and adaptation procedures in the controller.

To better understand the differences between manual, automatic, and dual-clutch transmissions and to make an informed choice when selecting a used gearbox, it is worth reading the guide: Gearbox: manual, automatic, or DSG – common faults and a guide to buying a used gearbox. The article discusses typical signs of wear, key inspection points, and practical tips for purchasing.

BMW automatic gearboxes – expansion and modernization

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 a torque converter, control elements, or additional transmission sub-assemblies, check the available parts in the BMW automatic gearboxes category.

For users interested in limiting the environmental impact of repairs and using recycled parts in a conscious and technically justified manner, the following material may be helpful: Eco-tuning in practice: how to increase performance while reducing your carbon footprint using recycled parts. It allows for better planning of repairs and modernizations while taking ecological aspects into account.