Mercedes W221 S350 Rear Diff Differential Axle Ratio 3,07 A2213502114 WARRANTY

Listing details

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

Mercedes W221 S350 Rear Diff Differential Axle Ratio 3,07 is a factory-original drivetrain component from the Differentials category, designed for rear-axle installation in Mercedes vehicles equipped with an automatic transmission. This used rear axle with this specific gear ratio allows for maintaining the correct drivetrain performance characteristics, ensuring stable torque transfer and predictable vehicle behavior during acceleration and cornering.

Specifications and technical data

• SKU: A2213502114
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2213502114
• Substitutable numbers: A2213502114, A 221 350 21 14, A2213503404, A 221 350 34 04
• Location on the vehicle: Rear
• Gearbox type: Automatic
• Category: Differentials

Purpose and technical specifications

The presented rear differential is dedicated to Mercedes W221 series luxury class models with the M272 engine, where it serves as a key component of the rear drive axle. Its placement on the rear axle and compatibility with the automatic transmission ensure that this component is responsible for smooth torque distribution between the wheels, reducing slippage and improving traction in daily operation.

The fixed 3.07 gear ratio is optimized for comfortable highway and city driving, providing a reasonable compromise between acceleration dynamics and drivetrain refinement at higher speeds. As a result, the drivetrain maintains consistent performance parameters in line with the factory calibration of the automatic transmission control unit.

Construction and role in the drivetrain

The rear axle in this Mercedes model integrates the final drive with the differential, creating a compact design adapted to handle the loads typical of premium class vehicles. The differential is responsible for:

• compensating for the difference in wheel rotational speeds during turns,
• stable transfer of torque from the driveshaft to the half-shafts,
• maintaining predictable handling characteristics at various speeds.

Thanks to its factory origin from Mercedes, the correct mounting points, geometry, and operating parameters are preserved, which facilitates installation and helps avoid fitment issues. The original design is engineered for high durability and compatibility with other suspension and drivetrain components.

Benefits of using a pre-owned differential

Choosing a used rear differential for a Mercedes W221 with a 3.07 ratio is a solution that allows you to maintain factory driving parameters while optimizing repair costs. Compared to aftermarket replacements of unknown origin, the original rear axle ensures:

• gear ratio consistency with the factory drivetrain configuration,
• preservation of the automatic transmission's operating characteristics as intended by the manufacturer,
• reliable fitment to factory mounting points and accessories.

This solution is particularly beneficial for repairs of premium class vehicles, where both the correct operation of electronic systems and driving comfort consistent with the manufacturer's specifications are paramount.

Gear ratio selection and vehicle compatibility

When replacing the rear axle in a Mercedes W221 with an M272 engine, it is crucial to maintain the correct gear ratio and compatibility with the installed automatic transmission. Incorrect selection can result in improper drivetrain operation, control unit errors, or changes in acceleration characteristics and engine RPM at cruising speeds.

To better understand the impact of gear ratios on driving style and to select the right component for your specific vehicle configuration, it is worth checking our guide: Dismantled drive axles and differentials – how to choose gear ratios for your driving style. The article discusses practical examples, definitions, and the most frequently asked questions related to replacing differentials and drive axles.

Mercedes differentials – expansion and drivetrain modernization

If you are planning a comprehensive repair or modernization of the drivetrain in your Mercedes and need other components from the same group, such as other differentials, drive axles, or complete final drive assemblies, check the available parts in the Mercedes Differentials category.

For owners of premium class cars who are considering the use of pre-owned components, the broader market context may also be helpful – you can find more on this topic in the article on the trend for used original parts for premium brands, which discusses the advantages of choosing OEM components from dismantling in the face of changes in the new parts market.