Mercedes W166 ML63 AMG Rear Axle Differential 3.47 Ratio A1663500414 WARRANTY

Listing details

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

Mercedes W166 ML63 AMG Rear Axle Differential 3.47 Ratio is an original drivetrain component from the Differentials category, designed for installation on the rear axle of the high-performance ML63 AMG version. The design, engineered for compatibility with a gasoline engine and an automatic transmission, ensures stable torque transfer and predictable vehicle behavior during dynamic driving.

Specifications and technical data

• SKU: A1663500414
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1663500414
• Substitutable numbers: A1663500414, A 166 350 04 14
• Location on the vehicle: Rear
• Fuel type: Petrol
• Gearbox type: Automatic
• Category: Differentials

Technical specifications and 3.47 ratio

The presented differential has been designed for the demanding operating conditions of a high-power premium SUV. The 3.47 ratio provides a balance between acceleration and comfortable engine RPM at higher speeds, which is particularly important in high-power, heavy vehicles.

The component operates within a drivetrain featuring a gasoline engine and an automatic transmission, requiring precisely matched gear characteristics and a robust housing. As a result, the differential efficiently transfers torque to the rear wheels, minimizing losses and ensuring stable handling during both acceleration and engine braking.

Purpose and installation compatibility

The differential is intended for rear axle installation in a drivetrain based on an automatic transmission and a gasoline engine. This configuration is typical for AMG versions, where precise matching of the gear ratio to the engine characteristics and transmission software is crucial.

Its original Mercedes origin allows for the maintenance of factory drivetrain performance parameters, including proper interaction with the vehicle's electronic systems (traction control, electronic stability program, automatic transmission adaptation). Consequently, this differential is the right choice for repairs where maintaining the stock handling characteristics and predictable vehicle response is a priority.

Benefits of using an original differential

Using an original rear differential in an ML63 AMG offers a range of practical benefits:

• preservation of the factory gear ratio, matched to the power and torque of the engine,
• proper interaction with the automatic transmission and its shift maps,
• stable power delivery to the rear wheels under high loads,
• consistency with factory safety and traction control systems.

For users expecting repeatable, predictable road behavior from their ML63 AMG, using such a precisely matched differential helps maintain the vehicle's character in accordance with the manufacturer's specifications. This is especially important during intensive use, where the drivetrain operates across a wide range of loads.

Practical application and technical tips

When replacing the rear differential in an ML63 AMG, it is worth paying attention to the compatibility of the ratio with the vehicle's current configuration and its interaction with other drivetrain components. A properly selected differential reduces the risk of improper automatic transmission operation, unwanted vibrations, or electronic system errors.

For mechanics and workshops specializing in the Mercedes brand, using an original component from the Differentials category facilitates the installation process and subsequent diagnostics. A used differential allows for an economical repair while maintaining a design consistent with factory specifications, which is significant for both fleet vehicles and private AMG examples.

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 differential housings, complete axle assemblies, or additional final drive sub-assemblies, check out the available parts in the Mercedes Differentials category.

Gear ratio selection and technical knowledge

When choosing a differential with a specific ratio, it is worth considering driving style, type of use, and drivetrain configuration. Proper ratio matching has a direct impact on acceleration, flexibility, and engine RPM during highway driving.

To better understand the relationships between axle ratio, engine characteristics, and automatic transmission operation, it is worth consulting our specialized guide: Dismantled drive axles and differentials – how to choose ratios for your driving style. The article discusses definitions, configuration examples, and practical tips regarding used drivetrain components in an accessible, technical manner.