BMW F21 F31 F33 125d 325d 425d B47 Automatic Gearbox GA8HP50 8649425 WARRANTY

BMW F21 F31 F33 125d 325d 425d B47 Automatic Gearbox GA8HP50 is a factory-original component designed for BMW models equipped with the B47 engine and electronically controlled drivetrain. This used automatic transmission provides a practical solution for powertrain repairs, ensuring the preservation of original performance characteristics and compatibility with the vehicle's electronics. Thanks to its OEM design, it is a component perfectly matched to the factory drivetrain architecture.

Specifications and technical data

• SKU: 8649425
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 8649425
• Substitutable numbers: 24008649425, 8649425
• Gearbox type: Automatic
• Category: Other Transmission & Drivetrain

Purpose and compatibility

The described automatic transmission is dedicated to selected versions of the BMW 1 Series F21, 3 Series F31, and 4 Series F33 with the B47 unit. Using an original transmission allows for maintaining consistency with factory ECU software, gear-shifting logic, and driver assistance systems. This is particularly important in vehicles where precise interaction between the gearbox, powertrain, and safety systems is essential.

Technical characteristics of the automatic transmission

The GA8HP50 automatic transmission belongs to the category of modern torque converter transmissions, where the priority is smooth gear shifting and efficient use of engine torque. The applied design enables:

• smooth acceleration without jerking,
• stable operation at higher RPMs,
• comfortable gear shifting in both city and highway driving modes.

Thanks to advanced control electronics, the gearbox integrates with vehicle systems such as traction control and drive modes, which translates into consistent vehicle behavior under various operating conditions.

Application in service practice

Replacing an automatic transmission with an original used component is often the most cost-effective solution for major transmission failures. This type of component allows you to:

• restore proper powertrain operation without expensive overhauls,
• maintain factory mounting points and connections to the driveshaft and oil cooling system,
• reduce vehicle downtime in the workshop thanks to its precise structural fit.

For workshops specializing in the BMW brand, this type of used automatic transmission is a valuable service component that enables efficient repairs while maintaining the original manufacturer's specifications.

Condition and compatibility verification

The item comes from the Other category, meaning it is a component that does not fall into typical, narrowly defined parts groups but is crucial for the operation of the powertrain. The gearbox is used; therefore, a standard service procedure is recommended before installation: checking for leaks, verifying mounting points, and preparing the oil system according to the vehicle manufacturer's guidelines. Thanks to OEM markings and interchangeable part numbers, it is possible to precisely match the transmission to a specific car configuration.

If you would like to further ensure the correct selection of the component based on manufacturer numbers or plan to compare several transmission variants, a guide on verifying parts by factory markings will be helpful – you can find it in the article how to safely buy components online using OEM numbers, prepared for users of BMW and other premium brands.

Further knowledge and related content

For those interested in comparing the characteristics of powertrains in sports and production cars, including the operation of automatic transmissions in high-performance model versions, we recommend the blog post Audi RS vs other models – what is hidden under the hood and chassis?, which discusses the differences in engine, brake, and chassis construction in the context of intensive use.

If you are planning a comprehensive repair or upgrade of the powertrain area in your BMW and need other elements from the same group, such as gearboxes, control units, or mounting elements, check the available parts in the Other BMW category.

Summary

BMW F21 F31 F33 125d 325d 425d B47 Automatic Gearbox GA8HP50 is an original, used component intended for professional powertrain repairs in selected BMW models. Using a factory automatic transmission allows for maintaining proper interaction with the vehicle's electronics, ensures predictable vehicle behavior on the road, and represents a sensible choice for workshops and users expecting compliance with manufacturer solutions.