BMW F10 F11 520i 528i N20 Rear Differential Diff 3,91 Ratio 7623128 WARRANTY

Listing details

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

BMW F10 F11 520i 528i N20 Rear Differential Diff 3,91 Ratio is an original drivetrain component from the Differentials group, designed for rear axle installation in selected BMW 5 Series models. The precisely selected gear ratio ensures stable torque transfer, and the OEM construction guarantees a perfect fit with the factory suspension and drivetrain geometry. This is a solution for users who expect predictable vehicle behavior and consistency with the factory driving characteristics.

Specifications and technical data

• SKU: 7623129
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7623129
• Substitutable numbers: 7623129, 05397623129, 7623128
• Location on the vehicle: Rear
• Category: Differentials

Purpose and compatibility for BMW F10 / F11

The presented differential is designed for BMW 5 Series F10 and F11 models with the N20 engine in 520i and 528i versions, where it is responsible for stable power distribution to the rear wheels. The installation location is the rear, which means integration with the rear drive axle and compatibility with the factory multi-link suspension of these models.

By maintaining the original design and the correct gear ratio, the differential allows for the preservation of factory acceleration parameters, engine RPM during highway driving, and the operational characteristics of stability control systems. This is particularly important when performing repairs after mechanical damage or when replacing a worn-out drive axle.

Technical and functional characteristics

The differential belongs to the Differentials group, meaning it is responsible for compensating for the difference in wheel rotational speed when cornering and for the efficient transfer of torque from the driveshaft to the rear wheel hubs. The final drive ratio has been selected to balance dynamics and fuel economy under typical operating conditions for a BMW F10/F11 with the N20 unit.

The component is designed for installation in the rear of the vehicle, on the axle supporting rear-wheel drive. The differential construction is compatible with factory mounts and half-shaft layouts, which facilitates installation and reduces the need for additional modifications. The correct gear ratio affects:

• proper throttle response in low and medium speed ranges,
• maintaining predictable engine RPM at constant speeds,
• consistent operation of traction control and stability systems.

Condition, origin, and benefits of use

The offered differential is a used component, which in practice means a favorable cost-to-functionality ratio while maintaining the original BMW specification. For many users, this is a sensible solution for drivetrain repair, allowing them to avoid the costs of purchasing a new axle while preserving the factory driving feel.

Using an original differential instead of a damaged or excessively worn component allows you to:

• restore proper rear-wheel drive operation,
• reduce noise and vibrations resulting from final drive damage,
• maintain compatibility with factory ECU settings and safety systems.

Gear ratio selection and technical support

When replacing a differential in a BMW F10/F11, it is crucial to match the gear ratio to the engine version and transmission to avoid incorrect engine RPM and errors in electronic system operation. It is worth verifying compatibility with the currently installed drive axle and the vehicle documentation, especially in the case of modified cars.

If you want to better understand how the axle ratio affects driving characteristics, fuel consumption, and vehicle behavior in various conditions, our blog guide will be helpful: Dismantled drive axles and differentials – how to choose gear ratios for your driving style. You will find practical tips on choosing a differential, configuration examples, and answers to frequently asked questions.

Expanding repairs within the BMW drivetrain

If you are planning a comprehensive repair or upgrade of the drivetrain area in your BMW and need other elements from the same group, such as other axles, differentials, or related components, check out the available parts in the BMW Differentials category.