BMW E81 E87 LCI E90 Rear Differential Diff 4,10 Ratio 7555315 RECONDITIONED

Listing details

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

BMW E81 E87 LCI E90 Rear Differential Diff 4,10 Ratio is a professionally reconditioned rear differential designed for BMW 1 Series and 3 Series models, ensuring precise torque transfer to the rear axle. By maintaining factory gear ratio parameters, the differential guarantees stable handling, predictable vehicle behavior, and proper integration with the vehicle's electronics. This is a solution for users who expect proven quality, technical accuracy, and guaranteed fitment rather than random replacements.

Specifications and technical data

• SKU: 7555315-1
• Mark: BMW (Genuine OE)
• Condition: Remanufactured
• OEM Part Number: 7555315
• Substitutable numbers: 33107555315, 33107555316, 7555315, 7555316
• Location on the vehicle: Rear
• Category: Differentials

Purpose and function of the BMW rear differential

The offered component belongs to the Differentials category and is responsible for distributing drive to the rear wheels, compensating for wheel speed differences, and maintaining the characteristic handling typical of BMW rear-wheel drive. The applied 4.10 ratio promotes dynamic acceleration, proving effective both in daily city driving and in more demanding conditions where quick drivetrain response is essential.

Its rear-mounted position allows for direct integration with the factory driveshaft and half-shafts, without the need for modifications to the body or suspension structure. Consequently, this differential is an advantageous choice when replacing a worn-out unit or performing drivetrain modifications on the rear axle.

Reconditioned differential – technical benefits

The reconditioned status means that the differential has undergone a process to restore full operational efficiency while maintaining key performance parameters. In practice, this translates to:

• restored geometry of the mating gear components,
• proper operation of the differential mechanism under load,
• reduced operational backlash within the manufacturer's specified limits,
• stable drivetrain performance at various speeds.

For the user, this means more predictable vehicle behavior, a lower risk of noise from the rear drivetrain, and reduced vibrations resulting from excessive gear wear. A reconditioned differential is also a reasonable cost compromise compared to a brand-new unit, while maintaining a high level of operational safety.

Fitment for BMW E81, E87 LCI, E90 and installation compatibility

The presented differential is designed specifically for selected versions of the BMW 1 Series (E81, E87 LCI) and 3 Series (E90), which facilitates part selection based on suspension design, drivetrain type, and rear subframe configuration. The correct final drive ratio is crucial for proper cooperation with the engine, transmission, and vehicle electronic systems, such as ABS or traction control.

To select a differential optimally suited to your driving style and vehicle configuration, it is worth paying attention to the gear ratio, body type, and vehicle usage (daily commuting, highway driving, dynamic use). A detailed discussion on selecting a rear axle and differential can be found in the article: Dismantled drive axles and differentials – how to choose gear ratios for your driving style, which describes differences in ratios, configuration examples, and practical service tips.

Practical application and user benefits

Replacing a worn rear differential with a reconditioned unit in a BMW allows you to restore the vehicle's original driving characteristics, reduce noise coming from the rear of the vehicle, and improve the smoothness of power delivery. This is particularly important in vehicles used intensively, where drivetrain loads are high and the precision of the gear operation has a direct impact on comfort and safety.

The main advantages of this solution include:

• maintaining the characteristic BMW handling thanks to the correct final drive ratio,
• the possibility of economical drivetrain repair without sacrificing quality,
• reduced risk of installation incompatibility compared to random replacements,
• consistent operation with factory traction control and stability systems.

Expanding the BMW drivetrain – related components

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

For drivers interested in a broader look at drivetrain solutions across different brands, including BMW, a review of AWD systems described in the article: xDrive, 4Matic, quattro or 4Motion – a comparison of AWD systems from BMW, Mercedes, Audi, and VW may also be helpful, as it discusses the construction, typical components, and service specifics of advanced drivetrain systems.