Automatic Gearbox BMW G30 G31 540iX G12 740iX B58 GA8HP50X 8685276 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 G30 G31 540iX G12 740iX B58 GA8HP50X is a factory-spec drivetrain component designed for BMW models equipped with xDrive and the B58 engine. This used automatic transmission from this series ensures smooth gear shifts, high operating refinement, and consistency with the vehicle's factory configuration, which is particularly important for professional repairs or drivetrain conversions.

Specifications and technical data

• SKU: 8685276
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 8685276
• Substitutable numbers: 8685276, 24008685276
• Gearbox type: Automatic
• Category: Automatic Transmission

Purpose and compatibility

The presented automatic transmission is designed to work with the B58 unit in BMW 5 Series G30/G31 540iX and BMW 7 Series G12 740iX models. The transmission design is adapted for the xDrive all-wheel-drive system, allowing for the maintenance of proper acceleration characteristics, stability, and drivetrain operation in these body styles.

By maintaining the original control architecture and gear ratios, the transmission works well with factory engine maps and driver assistance systems, which reduces the risk of adaptation and calibration issues after installation.

Technical characteristics of the automatic transmission

This is an automatic transmission that provides comfortable, predictable, and dynamic gear shifting in typical road conditions as well as under higher loads. The applied design enables:

• efficient transfer of the B58 unit's torque to the xDrive system,
• stable operation at higher highway speeds,
• smooth downshifts during overtaking and dynamic driving,
• retention of factory transmission operating modes (e.g., comfort and more dynamic modes, depending on the vehicle configuration).

The automatic design of the transmission supports modern drivetrain management systems, which translates into predictable throttle response, reduced jerking, and better utilization of the engine's potential in daily use.

Condition, origin, and advantages of using a used part

The offered transmission comes from the Automatic Gearbox BMW group and is a used component, which allows for a significant reduction in repair costs compared to a new transmission, while maintaining factory specifications. Choosing an original, used unit is beneficial wherever compliance with vehicle equipment, proper fitment to the drivetrain, and the possibility of continued operation in conditions close to factory standards are important.

Using an original automatic transmission instead of a damaged one minimizes the risk of compatibility issues, leaks, or incorrect control operation, which often appear with unreliable replacements. This solution is particularly recommended for workshops specializing in the BMW brand and users expecting consistency with the car's factory configuration.

Professional installation and service aspects

To fully utilize the potential of this transmission, installation in a specialized service center that has experience working with BMW automatic transmissions and appropriate diagnostic tools is recommended. Proper installation includes, among other things, checking the oil cooling system, verifying mounts and seals, and performing adaptation procedures in the vehicle's control units.

When replacing the transmission, it is also worth considering service activities such as changing the transmission oil (if required by the repair technology) and checking cooperating elements in the drivetrain. Such an approach increases the durability of the entire assembly and reduces the risk of the fault returning.

Expert support and selecting the right transmission

If you want to better understand the differences between manual, automatic, and DSG transmissions, typical symptoms of their wear, and key issues when buying a used transmission, check out our guide: Transmission: manual, automatic, or DSG – typical faults and a guide to buying a used transmission. This is a practical source of knowledge that will facilitate an informed choice of the right unit for your BMW.

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