BMW E46 Diesel 320d M47N Rear Differential Diff 2,56 Ratio 7526158 WARRANTY

BMW E46 Diesel 320d M47N Rear Differential Diff 2,56 Ratio with a 2.56 gear ratio is an original drivetrain component designed for the Diesel version, ensuring the correct torque transfer characteristics to the rear wheels. This is a used BMW part that allows for a technically correct replacement of a worn or damaged rear differential, while maintaining factory operating parameters.

Specifications and technical data

• SKU: 7556669
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7526158
• Substitutable numbers: 33107556669, 7556669, 33107526159, 7526159, 7526158
• Location on the vehicle: Rear
• Fuel type: Diesel
• Category: Additional Differential Parts

Purpose and function in the drivetrain

The presented rear differential is dedicated to the BMW 3 Series E46 320d with the M47N engine, running on Diesel fuel. This component is responsible for the proper distribution of torque to the rear wheels and matching the rotational speed of the driveshaft to the rotational speed of the wheels, in accordance with the factory-selected 2.56 gear ratio. As a result, the vehicle maintains proper dynamics, drivetrain refinement, and predictable behavior during acceleration and engine braking.

The placement of the differential in the rear of the vehicle allows for direct cooperation with the driveshaft and half-shafts, which is crucial for the stable operation of the entire drivetrain in rear-wheel-drive BMW designs.

Benefits of using an original BMW differential

Using an original BMW differential in the Diesel version ensures:

• retention of the factory gear ratio, which translates into predictable engine RPM at a given driving speed,
• proper cooperation with the stock drivetrain and engine management system,
• consistency of the vehicle's handling characteristics with the manufacturer's specifications.

For users who expect stable drivetrain operation and want to avoid problems resulting from the installation of unsuitable replacements, the original BMW rear differential is a technically safe and predictable solution.

Condition, fitment, and installation aspects

The offered differential is a used part, which in practice means a favorable cost-to-functionality ratio while maintaining the original BMW design. The component comes from a rear-wheel-drive vehicle, and its location in the rear zone makes it easier for mechanics to plan service work related to the replacement or diagnostics of the drivetrain.

Before installation, it is recommended to perform a standard verification of the condition of seals, backlash, and oil level in the differential, in accordance with BMW service procedures. A correctly selected differential with the proper 2.56 gear ratio allows you to avoid unwanted changes in driving characteristics, such as excessively high or low engine RPM at highway speeds.

Application in BMW E46 320d Diesel vehicles

The differential has been designed to work with the M47N unit in the Diesel version, which is important both for mechanical loads and for matching the stock software controlling the drivetrain operation. Choosing the right component for a specific engine-drivetrain configuration minimizes the risk of improper system operation, noise, or accelerated wear of other components, such as the driveshaft or half-shafts.

For workshops specializing in the BMW brand and users assembling parts themselves, the use of a dedicated differential for the E46 320d M47N is important from the point of view of durability and operational predictability.

Drivetrain expansion and selection of other components

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 additional housings, mounts, or seals, check out the available parts in the Other BMW differential parts category.

When completing a larger scope of work – from drivetrain elements to small mounting accessories – it is worth using a One-Stop-Shop approach. It allows you to select original used components in one place, optimize costs, and avoid problems with cheap replacements; you can find more practical tips in the article Comprehensive supply: from the engine to the smallest clip – how to assemble used car parts in one place?.