BMW E87 E90 E91 118i 318i N46 323i Rear Differential Diff 3.23 Ratio WARRANTY

Listing details

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

BMW E87 E90 E91 118i 318i N46 323i Rear Differential Diff 3.23 Ratio WARRANTY is an original drivetrain component from the Differentials category, designed for installation on the rear axle of selected BMW 1 and 3 Series models. The stable 3.23 ratio ensures predictable vehicle behavior, and the use of a factory differential helps maintain the proper handling characteristics and drivetrain performance.

Specifications and technical data

• SKU: 7524317
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7524317
• Substitutable numbers: 33107524317, 7524317, 33107524318, 7524318
• Location on the vehicle: Rear
• Category: Differentials

Purpose and function in the drivetrain

The presented rear differential is dedicated to BMW vehicles with N46 petrol engines in E87 and E90 body styles, including the 118i, 318i, and 323i versions. As a component mounted on the rear axle, it is responsible for distributing torque to the wheels and providing the correct gear ratio between the transmission and the wheel drive, which translates into smooth acceleration and predictable throttle response.

The fixed 3.23 ratio is a compromise between dynamics and fuel economy – while maintaining comfortable engine RPMs on the highway, the car remains sufficiently responsive in typical urban and suburban conditions.

Benefits of using an original BMW differential

Using an original BMW differential instead of a worn or damaged component allows you to maintain the factory drivetrain characteristics. Key advantages include:

• Proper fitment to the drivetrain – structural compatibility with half-shafts, the driveshaft, and mounts in the rear subframe.
• Correctly selected ratio – no need to modify control units or change gear-shifting strategies.
• Consistency with factory safety and traction control systems.

As a result, installing a 3.23 ratio differential in place of a part with the same ratio type does not require any interference with the vehicle's electronics or additional mechanical adaptations.

Practical application – repair, swap, upgrade

The rear differential with a 3.23 ratio is suitable both for standard replacement of a worn unit and for deliberate selection of a ratio tailored to a specific driving style. In practice, it:

• restores proper, predictable drivetrain operation in daily use,
• reduces unwanted noise and vibrations resulting from excessive wear of the old differential,
• facilitates vehicle stability at higher speeds thanks to the appropriate ratio.

If you want to better understand how the differential ratio affects vehicle behavior and how to choose a differential for your driving style, check out the article Dismantled drive axles and differentials – how to choose ratios for your driving style, where you will find practical examples and explanations.

Product characteristics and condition

The offered differential belongs to the group of used OEM BMW components, which means it comes from vehicle dismantling and retains the manufacturer's factory specifications. This type of solution is often chosen by informed users who expect compatibility with the car's original design without the need to use aftermarket parts with uncertain parameters.

If you want to learn why in many cases a used original part is a reasonable alternative to new aftermarket replacements, it is worth reading the guide 5 reasons why a used OEM part is a better choice than an aftermarket replacement. You will find specific arguments and examples from popular models there.

Expanding the BMW drivetrain – Differentials

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 additional axles, differentials with different ratios, or compatible rear-wheel drive components, check out the available parts in the BMW Differentials category.