BMW E81 E87 123d E90 LCI 320d Rear Differential Diff 3,15 Ratio 7591073 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 123d E90 LCI 320d Rear Differential Diff 3,15 Ratio is an original drivetrain component from the Differentials category, designed for installation on the rear axle of selected BMW models. It ensures proper torque transfer to the wheels, stable drivetrain operation, and predictable vehicle behavior in various road conditions. This is a solution for users seeking a proven, factory-spec component rather than aftermarket replacements of unknown origin.

Specifications and technical data

• SKU: 7591073
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7591073
• Substitutable numbers: 33107591074, 7591074, 33107566629, 7566629, 33107566628, 7566628, 33107591073, 7591073
• Location on the vehicle: Rear
• Category: Differentials

Purpose and function of the differential

The presented rear differential is structurally matched to the drive axle in compact and mid-size rear-wheel-drive BMW models. Its task is to distribute torque between the rear wheels and maintain the correct gear ratio, which translates into acceleration characteristics, flexibility, and the overall refinement of the drivetrain.

Thanks to the properly selected gear ratio, the differential supports dynamic yet economical vehicle operation. The appropriate ratio configuration affects:

• the car's throttle response in the low and mid-RPM range,
• driving comfort at highway speeds,
• traction stability during acceleration and downshifting.

Construction and vehicle placement

The differential is intended for installation in the rear of the vehicle, within the drive axle, as an integral part of the rear end. The housing design is adapted to operate under demanding conditions, taking into account the loads generated by the diesel engines used in BMW 1 Series and 3 Series models.

This solution works with the factory driveshaft and half-shafts, ensuring the consistency of the entire system. Proper fitment and mounting geometry facilitate installation in the vehicle, minimizing the need for additional modifications.

Benefits of using an original BMW differential

Using an original differential instead of a worn-out component helps restore proper drivetrain operation and reduce undesirable phenomena such as noise, jerking, or uneven torque transfer. This is particularly important in cars that utilize the potential of diesel engines with higher torque output.

Key advantages include:

• Factory fitment for a specific drivetrain configuration, without the need for mounting modifications.
• Ratio consistency with the characteristics of the gearbox and engine, which contributes to predictable vehicle behavior.
• Stable rear-end operation, essential both in daily driving and during more dynamic driving styles.

Condition and practical application

This component is sourced from dismantling and is intended for users who want to restore the efficiency of their BMW's rear-wheel drive in a cost-effective manner. This type of differential is suitable for both standard city and extra-urban use, as well as for vehicles used more intensively, where consistent drivetrain performance is important.

Before installation, standard workshop verification and a differential oil change are recommended to ensure proper lubrication conditions and extend the component's service life.

Gear ratio selection and additional technical information

Proper selection of the differential for a specific engine and gearbox version is crucial for maintaining factory driving parameters. If you have any doubts regarding the compatibility of the gear ratio with your car, it is worth consulting a mechanic or a drivetrain specialist to avoid incorrect fitment.

If you want to better understand how the rear-end ratio affects dynamics, fuel consumption, and drivetrain characteristics, check out the article Dismantled drive axles and differentials – how to choose gear ratios for your driving style, where you will find practical examples and answers to the most frequently asked questions.

Related products from the same group

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 rear ends, other differential variants, or compatible rear-drive components, check out the available parts in the BMW Differentials category.