BMW X3 G01 X4 G02 M40iX B58D Automatic Gearbox GA8HP51X - Z7Q 8742387 WARRANTY

Listing details

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

BMW X3 G01 X4 G02 M40iX B58D Automatic Gearbox GA8HP51X is a factory-original automatic transmission from the BMW range, designed for advanced M40iX versions with the B58D engine. This used gearbox from this series is a solution for drivers who expect precise drivetrain performance, the preservation of original gear-shifting characteristics, and high compatibility with the vehicle's factory electronics. By maintaining the manufacturer's specifications, it serves as a cohesive element of the drivetrain in X3 G01 and X4 G02 models.

Specifications and technical data

• SKU: 8742387
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 8742387
• Substitutable numbers: 8742387, 24008742387, 5A90939, 24005A90939
• Gearbox type: Automatic
• Part type: Automatic Transmission
• Category: Automatic Transmission

Purpose and compatibility

The presented automatic gearbox has been designed to work with the B58D unit in the M40iX versions of the BMW X3 G01 and BMW X4 G02 models. This ensures the preservation of the correct torque characteristics, appropriate gear-shifting maps, and proper cooperation with factory vehicle systems, such as the xDrive all-wheel-drive system or advanced stability control systems.

As an item from the Automatic gearboxes category, this transmission is dedicated to direct installation in the vehicle, without the need to adapt universal solutions. The appropriate design of the housing, mounts, and connections to the drivetrain allows for maintaining the factory assembly and service procedure.

Technical characteristics of the automatic gearbox

The automatic design of the transmission ensures smooth gear shifting, optimized for the dynamic driving characteristic of the M40iX version. The applied gearbox architecture is prepared to handle the high torque of the B58D unit, which translates into stable operation across a wide range of loads.

In practice, this means:

• maintaining appropriate acceleration dynamics,
• consistent operation with vehicle driving modes (comfort, sport – according to the car's configuration),
• correct cooperation with the engine control system and all-wheel drive.

Thanks to the factory specification, the transmission maintains proper shift points, which is particularly important in higher-power cars, where precision in drivetrain control affects safety and the predictability of vehicle behavior.

Use in service and upgrades

The used automatic gearbox for the BMW X3 G01 and X4 G02 M40iX will prove effective both for standard replacement of a damaged transmission and for comprehensive drivetrain rebuilding. Choosing an original unit from the same family allows for reducing the risk of software, sensor, and controller compatibility issues.

In the context of service, it is worth paying attention to:

• maintaining compatibility with the factory gearbox controller,
• proper fitment to the existing transmission oil cooling system,
• the ability to use factory mounting points and connections to the driveshaft.

This type of solution is particularly beneficial for workshops specializing in the BMW brand, where assembly repeatability and reducing the time needed for component adaptation are key.

Benefits of choosing an original BMW automatic gearbox

By choosing this gearbox, the user receives a component designed specifically to work with the M40iX B58D drivetrain. This means maintaining factory driving characteristics, predictable throttle response, and consistency with safety systems. For many users, the ability to maintain a vehicle configuration consistent with the manufacturer's documentation is also crucial, which is significant for future vehicle resale and computer diagnostics.

If you are planning a comprehensive repair or upgrade of your BMW's drivetrain and need other components from the same group, such as torque converters, control elements, or other automatic transmissions, check out the available parts in the BMW Automatic gearboxes category.

Expert support in choosing a used gearbox

Selecting the right automatic transmission, especially in higher-power versions, requires considering many factors: generation compatibility, drive type, engine version, and controller configuration. To better understand the differences between individual types of transmissions and typical signs of wear, it is worth using educational materials.

Practical tips on recognizing faults, the differences between manual, automatic, and DSG gearboxes, and the principles of safely purchasing a used transmission can be found in the article Gearbox: manual, automatic, or DSG – typical faults and a guide to buying a used gearbox. This will make it easier for you to assess which technical and operational parameters are crucial when choosing the right gearbox for your BMW.