Mercedes W213 C238 C257 AMG Rear Differential Diff A2573506400 3,06 WARRANTY

Listing details

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

Mercedes W213 C238 C257 AMG Rear Differential Diff is an original drivetrain component from the Differentials category, designed for rear axle installation in high-end Mercedes models. The carefully selected 3.06 gear ratio provides predictable traction characteristics, which is particularly important in high-performance AMG versions.

Specifications and technical data

• SKU: A2573506400
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2573506400
• Substitutable numbers: A2573506400, A 257 350 64 00, A2573506300, A 257 350 63 00
• Location on the vehicle: Rear
• Category: Differentials

Purpose and function in the drivetrain

The described rear axle is responsible for torque distribution to the rear wheels, while maintaining the correct gear ratio and handling stability. The differential design is tailored to the characteristics of Mercedes W213, C238, and C257 models in AMG variants, where precise traction under higher dynamic loads is essential.

Its rear-mounted position means the component works in direct conjunction with the half-shafts and suspension, influencing the vehicle's behavior during acceleration, engine braking, and cornering. The properly selected 3.06 gear ratio helps maintain a balance between flexibility at low speeds and highway driving comfort.

Benefits of using an original AMG differential

Using an original salvaged differential to replace a worn or damaged unit helps maintain the vehicle's factory handling characteristics. This is especially critical in AMG cars, where the drivetrain is precisely tuned for power, weight, and load distribution.

• maintaining compatibility with the factory rear-wheel-drive configuration,
• restoring the acceleration and transmission performance intended by the manufacturer,
• reducing the risk of malfunctions in electronic systems linked to the drivetrain.

A used differential from the original Mercedes production line offers a reasonable compromise between repair costs and maintaining a high level of quality and fitment.

Use in service and upgrades

The rear axle with a 3.06 gear ratio is suitable both for standard replacement of a worn part and for more advanced service work, such as drivetrain rebuilding or tailoring the car to a specific driving style. Proper differential selection has a direct impact on:

• vehicle throttle response and power delivery,
• engine RPM at cruising speeds,
• acoustic comfort and drivetrain refinement.

For users who want to better understand the relationship between axle ratio and vehicle behavior, a guide describing gear ratio selection and drivetrain component compatibility will be useful – this is discussed in detail in the article Salvaged drive axles and differentials – how to choose gear ratios for your driving style.

Selection and vehicle compatibility

To correctly match this differential to a specific Mercedes version, it is crucial to verify compatibility with the model designation, drive type, and rear axle configuration. The product has a dedicated OEM part number and interchangeable numbers, which facilitates unambiguous identification in service catalogs and parts selection systems, without the need for aftermarket replacements with uncertain parameters.

When planning more extensive drivetrain work – for example, simultaneous replacement of the transmission, half-shafts, or suspension components – it is worth considering the consistency of gear ratios and loads to avoid unwanted vibrations or improper operation of assistance systems.

Repair expansion – other Mercedes differentials

If you are planning a comprehensive repair or upgrade of the drivetrain area in your Mercedes and need other components from the same group, such as other rear axles, differentials with different gear ratios, or complete drivetrain assemblies, check the available parts in the Mercedes Differentials category.