BMW 3 Series E90 320si Rear Differential Diff 4,10 Ratio 7564878 WARRANTY

BMW 3 Series E90 320si Rear Differential Diff 4,10 Ratio with a 4,10 gear ratio is a specialized drivetrain component designed for rear-axle installation in the 320si version. A properly selected final drive ratio ensures dynamic torque transfer to the wheels, which translates into precise handling and predictable vehicle behavior in various road conditions. This is a solution for users who expect drivetrain parameters to be consistent with the factory characteristics of the 320si model.

Specifications and technical data

• SKU: 7564878
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7564878
• Substitutable numbers: 33107564878, 7564878, 33107564879, 7564879
• Location on the vehicle: Rear
• Category: Differentials

Purpose and function in the drivetrain

The presented rear differential is a component in the Differentials category, designed to operate in the drivetrain of the BMW 3 Series E90 320si version. The placement on the vehicle is the rear axle, where the differential is responsible for distributing torque between the wheels and working with other components of the drive axle.

The 4,10 ratio promotes dynamic acceleration and precise throttle response, which is particularly important in the sport-tuned 320si version. Maintaining the original ratio allows for the correct engine performance characteristics relative to vehicle speed and ensures proper cooperation with the control electronics.

Benefits of using an original differential

Using an original differential with a gear ratio consistent with the factory specification of the 320si model allows you to:

• maintain drivetrain consistency with the manufacturer's design,
• keep correct engine RPM at specific driving speeds,
• minimize the risk of improper operation of assistance systems,
• reduce the need for additional modifications to the drivetrain.

The item in used condition is a good choice for repairs where maintaining the original drive axle design while optimizing service costs is key.

Gear ratio selection and vehicle compatibility

When replacing the differential in a BMW 3 Series E90 320si, it is extremely important to match the gear ratio to the vehicle's factory configuration. Incorrect selection can result in changed driving characteristics, speed reading errors, or improper cooperation with the engine and transmission control systems. The presented differential has a factory 4,10 ratio, which makes it easier to maintain compliance with the original specification.

An additional advantage is the ability to verify compatibility via the OEM part number and interchangeable numbers, which are listed in the product's technical specification. This allows you to precisely check compatibility with a specific equipment version and vehicle year.

To better understand the impact of the gear ratio on driving characteristics and to choose a differential for your own driving style, it is worth reading the guide: Dismantled drive axles and differentials – how to choose gear ratios for your driving style.

Placement on the vehicle and installation aspects

The differential is designed for installation on the rear axle, in place of the factory drive axle. Proper installation requires maintaining drive shaft alignment, correct tightening of mounts, and checking connection tightness. In the case of replacing with a used part, it is also recommended to:

• verify the oil level in the gear after installation,
• check for play in the drivetrain,
• verify proper operation during a test drive.

A properly selected and installed differential improves the smoothness of power delivery, reduces unwanted vibrations, and supports vehicle stability at higher speeds.

Brand and product group

The offered item comes from the BMW group, which means maintaining factory geometry, mounting points, and performance characteristics tailored to the 3 Series E90 320si. Belonging to the Differentials category makes it easier to search for related drivetrain components, such as other gear ratio variants or axle parts.

If you are planning a comprehensive repair or upgrade of the drivetrain area in your BMW and need other parts from the same group, such as axle housings, final drives, or complete differential assemblies, check the available parts in the BMW Differentials category.

Summary

BMW 3 Series E90 320si Rear Differential Diff 4,10 Ratio is a solution intended for users who want to restore the proper operation of the drivetrain or maintain the factory driving characteristics of their car. The original design, dedicated gear ratio, and the ability to verify compatibility using the numbers in the technical specification make it a practical choice for repairs and upgrades within the rear drive axle.