Mercedes ML W166 Rear Axle Differential Diff 2,87 Ratio A1663503800 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 W166 Rear Axle Differential Diff 2,87 Ratio is an original drivetrain component from the Differentials category, designed for installation on the rear axle. The precisely selected 2.87 gear ratio ensures the correct operating characteristics of the drivetrain, stability, and driving comfort in Mercedes ML W166 series models. This is a solution for users who expect consistency with the factory configuration and predictable vehicle behavior.

Specifications and technical data

• SKU: A1663503800
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1663503800
• Substitutable numbers: A1663503800, A 166 350 38 00
• Location on the vehicle: Rear
• Category: Differentials

Purpose and function in the drivetrain

The described rear differential is responsible for distributing torque to the rear axle wheels, ensuring smooth cornering and proper traction during daily use. Its placement in the rear axle area means this component has a direct impact on handling stability, drivetrain refinement, and the level of noise transmitted to the cabin.

By maintaining the factory 2.87 gear ratio, the differential allows for the retention of original acceleration parameters, engine RPM during highway driving, and compatibility with the vehicle's electronics. This is particularly important in modern Mercedes designs, where drivetrain control units are calibrated for specific axle ratios.

Benefits of using an original rear differential

Using an original rear differential in a Mercedes ML W166 offers a number of practical benefits:

• preservation of factory drivetrain operating characteristics,
• consistency with traction control and electronic stability systems,
• proper fitment with the stock gearbox and control units,
• reduced risk of drivetrain malfunction associated with mixing different gear ratios.

For users who expect predictable car behavior, choosing such a differential is a way to maintain driving comfort and proper dynamics without the need for software intervention. Stable rear axle operation also translates into even tire wear and lower stress on other drivetrain components.

Installation characteristics and fitment

The differential is designed for installation in the rear of the vehicle, replacing the factory drive axle. The design, based on Mercedes engineering, allows for the retention of original mounting points and compatibility with stock half-shafts and suspension components. As a result, the replacement process is predictable for the workshop and does not require structural modifications.

The item comes from dismantling, which means it is a used part, but still serves as a valuable base for restoring full drivetrain efficiency. In practice, this allows for an economical repair while maintaining the vehicle's original technical specifications.

Gear ratio selection and technical support

When replacing the rear differential, it is crucial to match the gear ratio to the drivetrain configuration and driving style. It is worth paying attention to compatibility with the existing front axle (in 4x4 versions) and the control unit software. A well-selected 2.87 ratio provides a compromise between dynamics and fuel economy, which is important in heavier ML-class SUVs.

If you want to better understand how the axle ratio affects vehicle behavior, it is worth consulting specialized materials. A practical discussion of the topic can be found in the article Dismantled drive axles and differentials – how to choose gear ratios for your driving style, which describes the relationships between gear ratios, driving comfort, and component durability.

How to care for a differential from dismantling

To maximize the potential of a used rear differential, it is worth ensuring proper service after installation. It is crucial to use the correct gear oil, check for leaks, and periodically verify any play in the drivetrain. Such actions help reduce wear on gears and bearings, thereby extending the period of trouble-free operation.

Additional practical tips regarding the use of parts from dismantling can be found in the guide How to extend the life of used car parts?, which describes proven maintenance and inspection methods for components.

If you are planning a comprehensive repair or upgrade of the drivetrain area in your Mercedes and need other elements from the same group, such as axle housings, gear components, or additional rear-drive parts, check the available parts in the Mercedes Differentials category.