Mercedes ML W164 Rear Axle Differential Diff 3,09 Ratio A1643501214 WARRANTY

Listing details

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

Mercedes ML W164 Rear Axle Differential Diff 3,09 Ratio is a factory rear axle drivetrain assembly designed for Mercedes M-Class W164 generation models. This used differential from this series allows for a technically correct replacement of a worn-out axle, maintaining the proper gear ratio and ensuring stable torque transfer to the rear axle. It is a solution for users who expect consistency with the factory drivetrain design and predictable vehicle behavior.

Specifications and technical data

• SKU: A1643501214
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1643501214
• Substitutable numbers: A1643501214, A 164 350 12 14
• Location on the vehicle: Rear
• Category: Differentials

Purpose and function in the drivetrain

The described rear axle is a component from the Differentials category, responsible for distributing power to the rear wheels in the Mercedes ML W164. The 3,09 gear ratio allows for maintaining the drive characteristics intended by the manufacturer, which is important for dynamics, engine RPM during highway driving, and compatibility with automatic or manual transmissions.

Its rear-mounted position means the component works in direct connection with the driveshaft and half-shafts, influencing:

• smoothness of torque transfer to the wheels,
• traction stability during acceleration,
• operating refinement of the entire drivetrain under various loads.

Benefits of using an original differential

Using an original rear axle in the Mercedes ML W164 reduces the risk of compatibility issues that may arise with aftermarket parts having different gear ratios. Maintaining the correct final drive configuration is crucial for the proper operation of electronic systems, such as traction control or electronic stability programs. As a result, the vehicle maintains predictable throttle response, and the drivetrain operates within the load ranges designed by the manufacturer.

A used differential of this class is a particularly cost-effective solution while maintaining factory driving characteristics. For many Mercedes ML W164 users, this is an optimal compromise between budget and technical requirements.

Gear ratio selection and vehicle compatibility

The 3,09 ratio has a direct impact on engine RPM at a given speed and on the perceived acceleration dynamics. Proper selection of the rear axle for a specific ML W164 drivetrain version is essential to avoid:

• incorrect speedometer readings,
• excessive transmission load,
• disturbances in the operation of driver assistance systems.

Before purchasing, it is worth verifying the differential's compatibility with the vehicle configuration using the OEM part number and available interchangeable numbers in the technical specification. This allows for selecting a component that matches the factory assumptions of a specific engine and drivetrain version.

To better understand how the axle ratio affects driving characteristics, it is worth reading the guide: Dismantled drive axles and differentials – how to choose gear ratios for your driving style, which discusses practical configuration examples and the most common driver questions.

Using salvaged parts for Mercedes ML W164 service

Choosing a used differential for a Mercedes ML W164 is particularly justified for older vehicles, where the availability of new components can be limited and the cost of purchasing a brand-new axle is high. A salvaged part allows for restoring drivetrain efficiency while maintaining reasonable repair costs, which is important for both workshops and individual users.

If you are interested in a broader context of using salvaged components in older cars, the following article may be helpful: No parts at the dealership? How to handle repairs of older models using salvaged parts, which describes practical strategies for selecting and verifying such elements.

Expansion and service of the Mercedes rear drivetrain

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

Selecting components from one design group makes it easier to maintain the technical consistency of the entire system and speeds up service work, as the workshop can rely on parts with similar specifications and origin.

Summary

Mercedes ML W164 Rear Axle Differential Diff 3,09 Ratio is a practical solution for owners who want to restore the proper operation of the rear-wheel drive while maintaining the factory gear ratio and driving characteristics. A used component from this group allows for a technically correct repair, cost reduction, and maintaining proper cooperation with other drivetrain components in the Mercedes ML W164.