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 installation on the rear axle of selected BMW models. The precisely selected 2.56 gear ratio ensures the correct drivetrain operating characteristics, stability at higher speeds, and driving comfort. This is a solution for users who expect consistency with factory specifications and predictable vehicle behavior.

Specifications and technical data

• SKU: 7630821-1
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7630821
• Substitutable numbers: 7630821, 33107630821, 7578151, 33107578151
• Location on the vehicle: Rear
• Category: Differentials

Purpose and function in the drivetrain

The described rear differential is a drivetrain component in BMW F-series cars, responsible for distributing torque to the rear wheels and providing the correct gear ratio between the transmission and the driven axle. The 2.56 gear ratio promotes smoother, more economical driving while maintaining appropriate dynamics, which is particularly important in 530d and 730d models with high torque output.

Its placement on the vehicle at the rear axle ensures direct cooperation with the half-shafts and suspension, and the differential's construction is designed to handle the loads typical of high-power diesel units. As a result, the drivetrain maintains stability, and the vehicle handles predictably both on the highway and in daily use.

Benefits of using an original differential

Using an original differential in a BMW allows you to maintain the factory drivetrain characteristics without the need to modify other components. Key advantages include:

• maintaining the correct gear ratio, matched to the engine and transmission characteristics,
• consistency with the factory drivetrain configuration,
• proper cooperation with traction control and electronic stability systems,
• reducing the risk of drivetrain malfunctions resulting from the selection of an incorrect differential.

For the user, this means more predictable vehicle behavior, correct operation of the electronics responsible for traction, and no need for intervention in the drivetrain control software. In the case of BMW 5 and 7 series cars, this has a direct impact on driving comfort and safety.

Installation and operational characteristics

The rear differential is designed for installation in place of the factory unit, which facilitates service work and reduces replacement time. The design intended for the rear axle ensures compatibility with factory mounting points as well as stock suspension components and half-shafts. This allows the workshop to carry out the replacement in an orderly manner, without the need for structural adaptations or modifications.

As a used part, the differential represents a reasonable compromise between cost and functionality, allowing you to restore the efficiency of the drivetrain in a BMW while maintaining the original specification. This solution is particularly attractive for post-accident repairs or when replacing a worn-out differential in heavily used vehicles.

Gear ratio selection and vehicle compatibility

The 2.56 gear ratio has a significant impact on driving characteristics – engine RPM at highway speeds, throttle response, and overall drivetrain refinement. Proper selection of the differential is crucial to avoid issues with transmission operation, electronic system errors, or uncomfortable vehicle behavior.

If you want to better understand how the differential ratio affects driving dynamics and economy, as well as how to consciously choose a differential for your driving style, it is worth checking out our specialist guide: Dismantled drive axles and differentials – how to choose gear ratios for your driving style. You will find practical tips, definitions, and examples of applications in various models there.

Expanding your BMW drivetrain

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 additional axles, differentials with different ratios, or compatible rear-wheel drive components, check out the available parts in the BMW Differentials category.