Automatic Gearbox BMW F40 120dX B47D GA8G45XAW 8489920 9453614 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 F40 120dX B47D GA8G45XAW is a factory-original automatic transmission designed for Diesel units in modern BMW 1 Series F40 models with xDrive. This used gearbox from this series is a solution for drivers who expect to maintain the original characteristics of the drivetrain, smooth gear shifting, and proper integration with the vehicle's electronics.

Specifications and technical data

• SKU: 8489920
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 8489920
• Substitutable numbers: 24008489920, 8489920, 24609453614, 9453614, 24009844220, 9844220, 24009894820, 9894820
• Fuel type: Diesel
• Gearbox type: Automatic
• Category: Automatic Transmission

Purpose and technical specifications

The presented gearbox belongs to the Automatic gearboxes category and was designed specifically for the BMW F40 120dX model with a diesel engine. The use of an automatic transmission allows for comfortable, predictable acceleration, as well as stable operation across the full range of loads typical for Diesel units.

The automatic transmission design ensures:

• precise gear selection by the vehicle's control unit,
• consistent cooperation with traction and all-wheel-drive systems,
• appropriate operating characteristics for both city and highway driving.

Benefits of using an original BMW gearbox

Using an original gearbox dedicated to the BMW F40 120dX reduces the risk of mechanical and electronic compatibility issues. The transmission is prepared to work with factory engine control unit maps and safety systems, which translates into stable operation of the entire drivetrain.

Key advantages include, among others:

• preservation of factory gear-shifting characteristics – predictable throttle response and engine braking,
• consistency with the vehicle's original software,
• possibility of utilizing existing mounting architecture without structural modifications.

Condition, origin, and practical application

The gearbox is in used condition, which allows for an economical vehicle repair while maintaining the original BMW specification. This is a particularly beneficial solution when replacing a damaged transmission following a mechanical failure or issues with the automatic hydraulic system.

In practice, such a gearbox will prove useful in situations where:

• a quick replacement of a damaged automatic transmission in a BMW F40 120dX is necessary,
• the priority is to maintain the original drivetrain configuration,
• compatibility with the Diesel engine and factory control systems is important.

Selection and compatibility verification

To correctly select this gearbox for a specific BMW unit, it is worth verifying the transmission markings, engine type, and drivetrain configuration. The product has a dedicated OEM part number and interchangeable numbers, which facilitates unambiguous identification and matching to a specific equipment version.

In case of any doubts when choosing the right automatic transmission for a BMW with a diesel engine, the guide on our blog will be helpful: Gearbox: manual, automatic, or DSG – typical faults and a guide to buying a used gearbox, where we discuss the differences between gearbox types, typical symptoms of failures, and practical tips for purchasing used drivetrain components.

Expanding your BMW drivetrain modernization

If you are planning a comprehensive repair or modernization of the drivetrain area in your BMW and need other components from the same group, such as a torque converter, control elements, or additional hydraulic sub-assemblies, check the available parts in the BMW automatic gearboxes category.

This allows you to ensure the consistent technical condition of the entire system in a single service stage, minimizing the risk of further vehicle downtime and ensuring predictable operation of the automatic transmission in daily use.