BMW F30 F31 F32 F36 Rear Axle Differential Diff I=2,81 8485723 WARRANTY

Listing details

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

BMW F30 F31 F32 F36 Rear Axle Differential Diff I=2,81 is an original drivetrain component designed for installation on the rear axle of selected BMW F-series models. The precisely selected I=2,81 gear ratio allows for maintaining the proper acceleration characteristics and engine RPM, which is important for both daily driving and dynamic use. This is a solution for users who expect consistency with factory specifications and stable drivetrain performance.

Specifications and technical data

• SKU: 8485723-1
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 8485723
• Substitutable numbers: 8485723, 33108485723, 7605589, 33107605589
• Location on the vehicle: Rear
• Part type: Differential & Housing Assembly
• Category: Differentials

Purpose and function in the drivetrain

The described rear differential is a component responsible for distributing torque to the wheels of the driven axle and for maintaining the correct gear ratio of the entire drivetrain. In BMW F-series vehicles, such as the F30, F31, F32, or F36, a correctly selected differential is crucial for:

• handling stability at various speeds,
• smooth acceleration and downshifting,
• maintaining factory fuel consumption and engine RPM parameters,
• reducing unwanted vibrations in the drivetrain.

The I=2,81 gear ratio is often chosen by drivers who prefer a balanced compromise between flexibility at low RPM and highway driving comfort.

Construction and vehicle placement

The differential belongs to the Differentials category and is mounted in the rear part of the vehicle, on the driven axle. Its placement as a rear component ensures cooperation with the driveshaft and half-shafts, creating a cohesive drivetrain system from the gearbox to the wheels.

Such a design solution allows for:

• efficient torque transfer to the rear axle,
• maintaining the characteristic BMW rear-wheel drive,
• easier diagnostics and service compared to more complex systems.

Performance characteristics and application benefits

Choosing this differential is particularly beneficial when you want to maintain the original BMW handling characteristics. A properly selected gear ratio translates into:

• more predictable vehicle behavior in corners,
• consistent operation with factory drivetrain control software,
• acoustic comfort at cruising speeds.

This component, sourced from dismantling, also allows for optimizing repair costs while maintaining original BMW specifications, which is essential for users who care about compliance with factory solutions.

Condition, origin, and fitment

The differential is offered as a used part, meaning it has been removed from a BMW vehicle and verified for further use. This type of component is particularly attractive for those who:

• are looking for original solutions instead of replacements of unknown origin,
• want to maintain compliance with the factory drivetrain configuration,
• are planning a repair or upgrade of the drivetrain in an economical but technically correct manner.

To select the correct differential for a specific engine version and gearbox, it is worth paying attention to the gear ratio and compatibility with the body generation. Helpful tips on selecting gear ratios and configurations can be found in the article Driveshafts and differentials from dismantling – how to choose gear ratios for your driving style, where the relationships between gear ratio, driving characteristics, and compatibility are discussed in detail.

Support in selection and BMW drivetrain development

If you are planning a comprehensive repair or upgrade of the drivetrain area in your BMW and need other elements from the same group, such as drive axles, final drives, or other differentials, check the available parts in the BMW Differentials category.

Additionally, choosing original used drivetrain components can positively impact the reduction of raw material and energy consumption compared to the production of new replacements. If you are interested in the environmental aspect of such service decisions, it is worth reading the material Sustainable automotive: How purchasing original used parts reduces carbon footprint and protects the environment?, which discusses the practical benefits of reusing car parts.