BMW Z4 E85 2.5si N52 Rear Differential Diff 3,38 Ratio 7551911 WARRANTY

Listing details

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

BMW Z4 E85 2.5si N52 Rear Differential Diff 3,38 Ratio is a factory drivetrain component from the Differentials group, designed for installation on the rear axle of the BMW Z4 E85 2.5si model with the N52 engine. The precisely selected 3.38 gear ratio ensures consistent drivetrain performance, predictable dynamics, and stable operation of the rear axle during both daily and more dynamic driving.

Specifications and technical data

• SKU: 7551912
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7551912
• Substitutable numbers: 7551912, 33107551912, 7551911, 33107551911
• Location on the vehicle: Rear
• Category: Differentials

Purpose and function in the drivetrain

The presented differential is dedicated to the rear axle of the BMW Z4 E85 2.5si with the N52 unit, where it is responsible for distributing torque to the wheels and maintaining the correct gear ratio between the transmission and the driven axle. The 3.38 ratio configuration allows for maintaining the factory acceleration characteristics, engine RPM at cruising speeds, and the overall refinement of the drivetrain.

By adhering to the original specifications, the differential works seamlessly with the vehicle's stock electronics, stability control systems, and traction control, resulting in predictable vehicle reactions in various road conditions.

Benefits of using an original differential

Using a differential with the correct gear ratio in a BMW Z4 E85 2.5si N52 offers a range of practical advantages:

• maintaining factory handling characteristics and throttle response,
• proper compatibility with the stock transmission and half-shafts,
• consistency with factory safety system settings,
• reducing the risk of unwanted vibrations and noise resulting from gear ratio mismatches.

For the user, this means stable vehicle behavior, predictable dynamics, and comfortable operation without the need for modifications to the control software.

Condition, origin, and practical application

The offered item comes from dismantling and is classified as a used rear differential, making it an attractive cost-effective solution while maintaining the factory design. This type of component is particularly useful for:

• repairs following mechanical damage to the rear axle,
• eliminating noisy operation or excessive play in an existing differential,
• restoring the vehicle to its original specifications after previous gear ratio modifications.

Selecting a differential with the correct 3.38 ratio is crucial to avoid drivetrain performance issues, which is why it is worth verifying compatibility with the specific configuration of your BMW Z4 E85 2.5si N52 before installation.

Technical support and gear ratio selection

If you want to better understand how the differential ratio affects your BMW's behavior and how to choose a final drive for your driving style, it is worth consulting specialized materials. A practical discussion on the topic can be found in the article Dismantled drive axles and differentials – how to choose gear ratios for your driving style, which describes the relationships between gear ratio, dynamics, fuel consumption, and driving comfort.

If you are interested in what to look for when buying a used differential, how to assess its condition, and how to avoid common mistakes when assembling the drivetrain, the guide Second-hand differentials – what you need to know about used differentials, sensors, and drivetrains will be helpful, containing practical tips for users looking for durable and well-matched components.

Related items from the same group

If you are planning a comprehensive repair or upgrade of the rear axle drivetrain in your BMW and need other items from the same group, such as differential housings, input shafts, or additional differentials with different ratios, check out the available parts in the BMW Differentials category.

Summary

BMW Z4 E85 2.5si N52 Rear Differential Diff 3,38 Ratio is the right choice for users who want to restore the proper operation of the rear-wheel drive while maintaining the factory gear ratio and handling characteristics. A properly selected, used differential allows for reduced repair costs while maintaining consistency with the original design of the BMW Z4 E85 2.5si N52 and ensuring stable, predictable vehicle behavior in daily use.