BMW X3 E83 LCI 2.5si 3.0i N52N Rear Differential Diff 3,91 7567991 WARRANTY

Listing details

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

BMW X3 E83 LCI 2.5si 3.0i N52N Rear Differential Diff 3,91 is an original drivetrain component designed for rear-axle installation in BMW X3 E83 models equipped with 2.5si and 3.0i petrol engines. The precisely selected 3.91 gear ratio ensures stable handling, predictable acceleration characteristics, and consistent operation with the factory gearbox. This solution is intended for users and workshops that expect proven, factory-spec drivetrain geometry and reliable compatibility with the vehicle's construction.

Specifications and technical data

• SKU: 7567991
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7567991
• Substitutable numbers: 33107567992, 7567992, 33107567991, 7567991
• Location on the vehicle: Rear
• Category: Differentials

Technical characteristics and 3.91 gear ratio

The presented differential belongs to the Differentials category and is specifically designed to work with the rear-wheel drive system of the BMW X3 E83. The 3.91 gear ratio is a configuration frequently chosen for versatile vehicles – it combines dynamic acceleration from a standstill with comfortable operation at highway speeds. As a result, the car maintains good flexibility, and throttle response remains predictable and consistent.

The differential is responsible for distributing torque to the rear wheels, compensating for rotational speed differences in corners, and ensuring driving stability. A properly selected gear ratio translates into:

• factory-consistent drivetrain gearing,
• maintenance of stock acceleration and engine RPM parameters,
• reduction of unwanted vibrations and stress within the drivetrain.

Compatibility with BMW X3 E83 2.5si / 3.0i

The differential has been configured for use with 2.5si and 3.0i petrol engines in the BMW X3 E83, which facilitates part selection in the event of a failure or drivetrain rebuild. Using a component dedicated to a specific generation and engine version minimizes the risk of compatibility issues, such as incorrect engine RPM at a given speed or errors in the operation of driver assistance systems.

The installation location is the rear axle, meaning the differential works directly with the driveshaft and rear half-shafts, transferring torque from the final drive to the wheels. Proper fitment of this component is crucial for maintaining correct suspension and drivetrain geometry.

Benefits of using an original BMW differential

Choosing a differential from the BMW family primarily ensures the preservation of factory drivetrain operating parameters. The appropriate housing design, gear set, and fitment to stock mounts mean that installation, in most cases, does not require structural modifications. This is important for both workshops and individual users who want to minimize vehicle downtime.

The component from the Differentials category allows for:

• restoring proper rear-wheel drive operation after a factory differential failure,
• maintaining the stock driving character of the BMW X3 E83,
• ensuring compatibility with factory traction control and stability systems.

Application area and drivetrain upgrades

The rear differential is one of the key elements of the vehicle's drivetrain zone. Replacing this component often involves inspecting other sub-assemblies within the axle, such as half-shafts, bearings, or mounting elements. If you are planning a comprehensive repair or upgrade of the drivetrain in your BMW and need other parts from the same group, such as other differentials, drive axles, or final drive components, check out the available parts in the BMW Differentials category.

Gear ratio selection and safe purchase of a used differential

Before choosing a specific differential, it is worth analyzing your driving style, drivetrain configuration, and expected vehicle behavior. The 3.91 gear ratio will be suitable for drivers who expect a balanced compromise between dynamics and engine RPM comfort. To better understand the impact of gear ratios on car characteristics and the principles of selecting a drive axle, it is worth reading the article Dismantled drive axles and differentials – how to choose gear ratios for your driving style.

When purchasing a used differential, it is also important to verify compatibility via the OEM number and interchangeable part numbers, as well as matching it to the specific body and drivetrain version. Additional tips on safely choosing parts from the secondary market, including strategies for selection based on manufacturer markings and practical verification steps, can be found in the guide Safe purchase of used car parts online – a step-by-step guide.