BMW E81 E87 E90 LCI 118d 318d N47 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 E81 E87 E90 LCI 118d 318d N47 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 models equipped with the N47 engine. The carefully selected gear ratio ensures stable torque transfer, and the used condition of the part allows for an economical yet technically sound repair of the drivetrain.

Specifications and technical data

• SKU: 7572800
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7572800
• Substitutable numbers: 33107591021, 7591021, 33107591020, 7591020, 33107572801, 7572801, 33107572800, 7572800
• Location on the vehicle: Rear
• Category: Differentials

Purpose and function in the drivetrain

The rear differential in BMW 1 Series E87 and 3 Series E90 models with the N47 engine is responsible for torque distribution between the rear wheels and maintaining the correct gear ratio for the entire drivetrain. The properly selected 3.23 ratio affects acceleration characteristics, engine RPM at highway speeds, and the overall refinement of the drivetrain.

This component is crucial for maintaining proper traction, vehicle stability, and predictable handling during acceleration, engine braking, and cornering. A correctly selected rear differential allows for the maintenance of factory handling parameters, which is particularly important in rear-wheel-drive BMW vehicles.

Benefits of using an original differential

Using an original differential dedicated to specific versions of the BMW E87 118d and E90 318d with the N47 engine ensures:

• Factory fitment to the geometry of the rear suspension and drivetrain.
• Proper compatibility with the driveshaft and half-shafts, without the need for modifications.
• Consistency with factory transmission performance characteristics and engine management.
• Reduced risk of incorrect gear ratios that could affect dynamics and fuel consumption.

A used differential of this type is a good solution for post-accident repairs, replacement after mechanical wear, or restoring a vehicle to a near-factory configuration after previous modifications.

Vehicle placement and installation aspects

The presented differential is designed for installation on the rear axle of the vehicle. This requires work in the area of the rear suspension, final drive mounts, and connections to the driveshaft and half-shafts. During replacement, it is recommended to:

• check the condition of the differential mounts and suspension bushings,
• verify the tightness of connections and the condition of the seals,
• check for play in the shafts and joints before final installation.

A correctly installed rear differential minimizes vibrations, noise, and uneven tire wear, which translates into more predictable handling and driving comfort.

Application in BMW models with the N47 engine

The differential has been designed to work with the N47 engine in the 118d and 318d versions, meaning it is matched to the torque characteristics of this engine. As a result:

• proper flexibility is maintained at low and medium RPM,
• the car retains predictable acceleration across the full speed range,
• the drivetrain operates within the load ranges specified by the manufacturer.

Such matching is particularly important for daily use, where consistent throttle response, stability at higher speeds, and driving comfort on long trips are essential.

Part condition and practical application

The offered rear differential is a used part, which allows for reduced repair costs while maintaining the original BMW design. Components of this type are popular choices for:

• repairs following mechanical damage to the differential,
• replacing worn drivetrain components,
• restoring a car to near-factory specifications.

Before installation, a standard workshop inspection is recommended to confirm compatibility with the specific vehicle version and to assess the technical condition for further use.

Related products and technical knowledge

If you are planning a comprehensive repair or upgrade of the drivetrain area in your BMW and need other components from the same group, such as differential housings, mounts, or additional final drive elements, check out the available parts in the BMW Differentials category.

To better understand gear ratio selection and the impact of the final drive on driving characteristics, it is worth reading the practical discussion in the article Dismantled final drives and differentials – how to choose gear ratios for your driving style, where you will find definitions, configuration examples, and tips regarding used components.