Mercedes W221 Rear Diff Differential Axle Ratio 2,65 A2213503914 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 Rear Diff Differential Axle Ratio 2,65 is an original drivetrain component from the Differentials category, designed for installation on the vehicle's rear axle. It ensures proper torque distribution between the wheels, which translates into stable handling and predictable car behavior in various road conditions. This solution is dedicated to users who expect a proven, factory-spec design tailored to the specifics of high-end Mercedes models.

Specifications and technical data

• SKU: A2213503914
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2213503914
• Substitutable numbers: A2213503914, A 221 350 39 14, A2213510108, A 221 351 01 08
• Location on the vehicle: Rear
• Category: Differentials

Technical characteristics of the Mercedes W221 rear differential

The presented differential is designed as a component of the rear drive axle in the W221 generation Mercedes S-Class. The 2.65 gear ratio is typical for comfortable, highway-oriented configurations, where ride smoothness, lower engine RPM at higher speeds, and calm, predictable drivetrain response are prioritized. The differential's construction is optimized for handling the high torque characteristic of the engines used in this model.

Its placement on the rear axle allows for effective interaction with the suspension and the electronics responsible for vehicle stability control. As a result, the differential supports the operation of safety systems, ensuring consistent vehicle behavior during acceleration, engine braking, and cornering.

2.65 gear ratio and driving characteristics

The 2.65 gear ratio promotes calm, economical operation, especially when driving at higher speeds. In practice, this means:

• lower engine RPM at highway speeds,
• more linear power delivery,
• balanced acceleration, matched to the character of a luxury limousine,
• acoustic comfort inside the vehicle.

For drivers who value smoothness and stability, this drive axle gearing is a beneficial compromise between dynamics and ride comfort.

Application, selection, and compatibility

The differential is intended for installation on the rear axle in Mercedes vehicles where this type of design solution was factory-fitted. When selecting the component, it is crucial to match the gear ratio, drive type, and the body and engine version. Using the correct differential allows for the proper operation of the transmission, traction control systems, and driving stability assistance systems.

To ensure that the selected differential is suitable for a specific vehicle configuration, it is worth verifying compatibility with service documentation or consulting a mechanic specializing in the Mercedes brand. A correctly selected component reduces the risk of improper drivetrain operation, excessive vibrations, or premature tire wear.

Condition, origin, and advantages of using an original differential

The offered differential is a secondary market component, which allows for repair cost optimization while maintaining the factory design and geometry of the drivetrain. Using an original component from the same model family ensures:

• consistency with factory design specifications,
• proper fitment with rear suspension mounts,
• compatibility with stock half-shafts and accessories,
• preservation of the handling characteristics intended by the manufacturer.

For workshops and individual users, this means fewer installation modifications and a faster replacement process, which translates into an efficient drivetrain repair.

Gear ratio selection and practical tips

When replacing a differential in a Mercedes W221, it is particularly important to maintain gear ratio compatibility with the factory configuration or to make an informed decision regarding any changes. This directly affects acceleration characteristics, engine RPM, and cooperation with the automatic transmission. For users who want to better understand the relationship between the drive axle ratio and driving style, the following guide will be helpful: Dismantled drive axles and differentials – how to choose ratios for your driving style.

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

Additional information on how to effectively use the secondary market while maintaining high-quality repairs is also provided in our guide to popular used components: Best used car parts – a guide to the most frequently chosen original parts.