BMW E39 E46 E85 325i 525i M52 M54 Automatic Gearbox 7505951 1422912 WARRANTY

BMW E39 E46 E85 325i 525i M52 M54 Automatic Gearbox is an automatic transmission designed for BMW vehicles with petrol engines, ensuring smooth gear changes and stable torque transfer. This solution is dedicated to users looking for a proven drivetrain component that will restore proper transmission operation and maintain the driving dynamics characteristic of BMW. By adhering to the manufacturer's specifications and being tailored to specific models, the gearbox provides a solid foundation for professional drivetrain repair.

Specifications and technical data

• SKU: 7505952
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7505951
• Substitutable numbers: 24007505952, 7505952, 24007505951, 7505951, 24001422913, 1422913, 24001422912, 1422912
• Fuel type: Petrol
• Gearbox type: Automatic
• Category: Other Transmission & Drivetrain

Purpose and compatibility with BMW models

The described automatic gearbox has been designed to work with M52 and M54 series petrol units in BMW E39 525i, BMW E46 325i models, and the BMW E85 roadster. This ensures correct shift points, appropriate gear ratios, and proper communication with the vehicle's factory electronics. Using a transmission dedicated to these specific engine-drivetrain configurations reduces the risk of fitment issues and facilitates the installation process in a specialized workshop.

Characteristics of the automatic gearbox

The automatic transmission in this application is responsible for precise and repeatable gear shifting across the full RPM range of the petrol engine. The design is adapted to the characteristics of the M52/M54 units, which translates into:

• properly selected gear ratios for city and highway driving,
• stable power transfer during dynamic acceleration,
• maintaining gear shift comfort without jerking, provided the auxiliary equipment is functioning correctly,
• compatibility with factory transmission operating modes (e.g., economical and more dynamic – depending on the car's configuration).

As a result, the gearbox allows for maintaining the balance between comfort and throttle response typical of BMW, which is particularly important in the 325i and 525i models, as well as in the lighter, sportier E85.

Use in drivetrain repairs and upgrades

This type of automatic gearbox is suitable both for standard replacement of a damaged transmission and for comprehensive drivetrain rebuilding. It can be used in situations where the current gearbox shows symptoms such as noticeable jerking, problems with shifting into higher gears, or incorrect behavior during downshifts. Using a component that complies with factory specifications allows you to:

• restore proper automatic operation without the need for costly system modifications,
• maintain the original vehicle handling characteristics,
• preserve compatibility with existing controls and petrol engine auxiliary equipment.

For workshops specializing in the BMW brand, this is a practical solution that enables efficient repair execution while maintaining high consistency of the final result.

Condition, verification, and installation aspects

The offered gearbox is a used component, which in practice means that a detailed inspection at a specialized workshop is recommended before installation, and if necessary, refreshing the auxiliary equipment (e.g., changing oil, filter, and seals in accordance with the manufacturer's procedures). Such an approach helps minimize the risk of future leaks and ensures stable transmission operation in the long term.

Due to the specifics of automatic gearboxes in BMWs, installation should be carried out by an experienced workshop that will ensure proper adjustment, system bleeding, and potential transmission adaptation in the ECU. A properly performed installation procedure is crucial for smooth gear shifting and the durability of the entire system.

Expanding knowledge and selecting related parts

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 transmission mounts, check out the available parts in the Other BMW category.

For a better understanding of the differences in drivetrain construction and the impact of the gearbox on performance and handling characteristics, it is worth reading the material comparing sports and standard drivetrain configurations – you can find them in the article Audi RS vs other models – what is hidden under the hood and chassis?, which discusses, among other things, the relationships between the engine, brakes, chassis, and component selection.