BMW 1 3 e87 e90 116i 120i 323i Differential Diff 3,73 ratio 7524323 WARRANTY

BMW 1 3 e87 e90 116i 120i 323i Differential Diff 3,73 ratio is an original drivetrain component from the Differentials category, designed for installation in the rear axle of selected BMW 1 and 3 Series models. Thanks to its factory 3,73 gear ratio, it ensures consistent drivetrain performance, predictable traction, and stable rear axle operation during both daily and more dynamic driving.

Specifications and technical data

• SKU: 7524323
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7524324
• Substitutable numbers: 33107524324, 7524324, 33107524323, 7524323
• Location on the vehicle: Rear
• Category: Differentials

Application and technical specifications

The presented differential is designed for installation on the vehicle's rear axle, working in conjunction with the factory driveshaft and half-shafts in BMW 1 Series E87 and 3 Series E90 models equipped with 116i, 120i, and 323i petrol engines. The 3,73 ratio allows for maintaining the proper acceleration parameters and engine RPM, in accordance with the manufacturer's factory specifications.

This part is sourced from vehicle dismantling, meaning it is an original BMW component, not a replacement part of uncertain specification. This type of differential is particularly important for drivetrain repairs where maintaining gear ratio compatibility with the current transmission and engine control unit is required.

Benefits of using an original differential

Using a factory differential with a 3,73 ratio in a BMW E87/E90 provides a number of practical benefits:

• Consistent driving characteristics – maintaining the factory drivetrain tuning, without unwanted changes in dynamics or engine RPM.
• Better compatibility – perfect fit for standard mounts, half-shafts, and the driveshaft, which facilitates installation and reduces the risk of drivetrain geometry issues.
• Stable rear axle operation – correct torque distribution to the rear wheels, which translates into predictable vehicle behavior on both dry and wet surfaces.
• Cost-effectiveness compared to new parts – a used OEM differential is a reasonable compromise between cost and durability, especially for repairs of daily-driven vehicles.

Gear ratio selection and drivetrain compatibility

When replacing a differential in a BMW E87 or E90, it is crucial to match the gear ratio to the transmission and engine characteristics. The 3,73 ratio is a solution used in specific drivetrain configurations, which is why this differential model is ideal for repairs where the goal is to maintain factory driving parameters without interfering with electronics or engine management.

To better understand how the axle ratio affects acceleration, top speed, and driving comfort, it is worth consulting a specialist guide. A detailed discussion can be found in the article Dismantled drive axles and differentials – how to choose gear ratios for your driving style, which describes practical configuration examples and the most common mistakes when selecting a differential.

Condition, origin, and practical application

The differential is sourced from a dismantled BMW vehicle, which allows for maintaining factory build quality and compliance with the manufacturer's original technical documentation. As a used part, it is particularly attractive in situations where a quick and economical drivetrain repair is necessary following a mechanical failure or wear and tear.

In practice, such a differential is chosen both for standard replacement of a damaged axle and for drivetrain modifications within the same BMW generation, when the user wants to maintain predictable, near-factory driving characteristics.

Expanding your BMW drivetrain repair

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, driveshafts, or additional differentials with different ratios, check out the available parts in the BMW Differentials category.