BMW F01 F07 F10 530d 730d Rear Differential Diff 2,56 Ratio 7578151 WARRANTY

Listing details

The differential is sold with a 90-day warranty! It was tested before removal and is in full working order.

BMW F01 F07 F10 530d 730d Rear Differential Diff 2,56 Ratio is an original drivetrain component from the Differentials category, designed for rear-axle installation in selected high-end BMW models. Thanks to its factory gear ratio, it ensures consistent drivetrain performance, predictable traction, and stable operation of the vehicle's electronics. This is the ideal solution for users who expect a precise fit to manufacturer specifications and wish to maintain the driving characteristics typical of the 5 and 7 Series.

Specifications and technical data

• SKU: 7630821
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7630820
• Substitutable numbers: 33107630821, 33107630820, 7630821, 7630820, 33107578152, 7578152, 7578151, 33107578151
• Location on the vehicle: Rear
• Category: Differentials

Purpose and function of the differential

The presented rear differential is a component of the BMW drivetrain system, responsible for distributing torque to the rear wheels and providing the correct gear ratio between the driveshaft and wheel hubs. The 2.56 gear ratio allows for the maintenance of the smooth operation characteristic of diesel engines, lower RPMs at highway speeds, and a quieter, more economical driving experience.

The differential is mounted in the rear position, working in conjunction with the vehicle's factory suspension and drivetrain. Selecting the correct differential for a specific engine version and body style is crucial for the proper operation of systems such as ABS, DSC, or the automatic transmission.

Benefits of using an original BMW differential

Using an original differential from a vehicle dismantler allows you to maintain factory drivetrain performance parameters without the need for vehicle modifications. In practice, this means:

• proper fitment to the mounting points and geometry of the rear suspension,
• consistent compatibility with the driveshaft and half-shafts,
• preservation of the stock acceleration characteristics and engine RPM range,
• no need for interference with drivetrain control unit software.

For owners of 530d and 730d models, this is a solution that restores full drivetrain efficiency after a failure or wear of the previous differential, while maintaining factory driving comfort.

Condition, origin, and practical application

The offered differential is a used component, sourced from a dismantled BMW vehicle. Such components are frequently chosen by workshops specializing in premium car service because they allow for technically sound repairs while maintaining reasonable costs. A rear differential of this type is suitable both for the standard replacement of a worn-out part and for the reconstruction of a complete drivetrain after a collision.

Thanks to the preservation of the original design and gear ratio, the differential works well with stock traction control systems and factory transmission settings, which is particularly important in modern BMW F-series models.

Gear ratio selection and vehicle compatibility

When replacing a differential, it is crucial to match the gear ratio to the engine version, vehicle weight, and transmission characteristics. For diesel units, longer gear ratios are typically used, which lower engine RPM at higher speeds and improve comfort on long journeys. The correct choice of differential helps avoid issues with automatic transmission operation, electronic system errors, and incorrect speedometer readings.

If you want to better understand how the differential ratio affects vehicle behavior, it is worth consulting specialized materials. A detailed discussion of the topic can be found in the article Dismantled drive axles and differentials – how to choose gear ratios for your driving style, which describes various configurations, application examples, and practical tips for BMW owners.

BMW Differentials – expansion and drivetrain modernization

If you are planning a comprehensive repair or modernization of the drivetrain in your BMW and need other components from the same group, such as additional axles, alternative differentials, or complete rear-drive assemblies, check out the available parts in the BMW Differentials category.

Increasingly, owners of premium cars are choosing original used components over replacements of unknown origin. If you want to learn more about the broader market context and why this solution is gaining popularity, check out the post Crisis in the new parts market? Why used originals for premium cars (BMW, Mercedes, Porsche) are the hottest trend in 2026.