BMW 3 Series E46 Rear Differential Diff 7518806 1428129 3,07 Ratio WARRANTY

BMW 3 Series E46 Rear Differential Diff with a 3.07 ratio is an original drivetrain component designed for rear axle installation. This solution is dedicated to drivers who expect stable torque transfer, predictable vehicle behavior, and the maintenance of factory handling characteristics.

Specifications and technical data

• SKU: 7518807
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7518806
• Substitutable numbers: 33107518807, 7518807, 33107518806 33101428130 33107503991, 7518806 1428130 7503991, 33101428129 33107503992, 1428129 7503992
• Location on the vehicle: Rear
• Category: Additional Differential Parts

Purpose and function in the drivetrain

The presented rear differential is structurally matched to the BMW 3 Series E46 platform and operates within the rear drive axle assembly. It is responsible for distributing torque between the rear wheels, and its 3.07 ratio affects acceleration characteristics and engine RPM when driving at a constant speed.

Selecting the correct gear ratio is important for both performance and fuel economy. Using this specific variant allows for maintaining parameters close to factory specifications, which is essential during repairs when predictable vehicle behavior and compatibility with the existing transmission and electronics are required.

Construction and performance parameters

The differential is designed as a component mounted on the rear axle, with a housing adapted to the standard mounting points of the E46 chassis. The design is intended to work with factory half-shafts and the driveshaft, which facilitates installation and reduces the need for additional modifications.

Original manufacturer markings and available interchangeable numbers allow for precise verification of compatibility with a specific engine and drivetrain version. As a result, the differential can be safely used as a replacement part in professional repairs where compliance with BMW service documentation is a priority.

Condition, origin, and benefits of using a used part

The item comes from dismantling and is offered as a used part, which represents a reasonable compromise between repair costs and maintaining the original technical specification. In practice, this means the ability to restore the efficiency of the drivetrain without the need to invest in expensive replacements of uncertain origin.

Using an original used differential allows you to:

• maintain the factory gear ratio and drivetrain operating characteristics,
• preserve compatibility with standard suspension and drivetrain components,
• reduce service costs while maintaining high manufacturing quality.

Selection, installation, and compatibility with other components

Before installation, it is recommended to verify the compatibility of the differential with the specific BMW E46 version based on the VIN and service documentation. Thanks to the presence of the OEM part number and interchangeable numbers, the workshop can precisely match the component to the given body, engine, and transmission variant.

A properly selected differential minimizes the risk of improper fitment, gear ratio mismatch, or unwanted vibrations in the drivetrain. This is particularly important in cars where handling precision and stability at higher speeds, typical of BMW rear-wheel-drive designs, are valued.

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 differential housings, mounts, or additional final drive elements, check out the available parts in the Other BMW differential parts category.

Technical support and knowledge about differentials

When choosing a gear ratio for your driving style – whether more dynamic or focused on calm, economical operation – it is worth relying on reliable technical knowledge. Practical tips regarding drive axles, differentials, and matching gear ratios to specific applications can be found in the article Drive axles and differentials from dismantling – how to choose gear ratios for your driving style, which discusses key issues related to this type of component in an accessible way.

Additionally, if you are interested in the broader context of using original used parts in premium cars and want to better understand how to combine comfort, durability, and reasonable service costs, it is worth reading the material Mercedes – comfort, prestige, and durability. Why is it worth choosing original used parts?, which shows the advantages of this approach also in relation to other brands.