Mercedes Vito W639 Rear Differential Diff Axle 3,455 Ratio A6393502714 WARRANTY

Listing details

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

Mercedes Vito W639 Rear Differential Diff Axle 3,455 Ratio is a complete rear drive unit from the Differentials category, designed for installation in the vehicle's rear axle. The precisely selected 3.455 gear ratio ensures balanced traction parameters, stable drivetrain operation, and predictable vehicle behavior during daily use.

Specifications and technical data

• SKU: A6393502714
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6393502714
• Substitutable numbers: A6393503114, A 639 350 31 14, A6393502714, A 639 350 27 14
• Location on the vehicle: Rear
• Category: Differentials

Technical characteristics and 3.455 gear ratio

The axle with differential used in the Mercedes Vito W639 is responsible for transferring torque to the rear wheels and ensuring proper distribution of driving force between the half-shafts. The 3.455 gear ratio is a configuration frequently chosen for commercial vehicles, where a balance between acceleration dynamics and fuel economy at cruising speeds is essential.

This gear ratio selection translates into:

• efficient starting under load,
• stable engine RPM during highway driving,
• predictable drivetrain behavior in both urban and extra-urban conditions.

As a result, the axle with differential performs well in both delivery applications and specialized conversions, where consistency and predictability of the drivetrain are important.

Purpose and vehicle placement

The described component is intended for installation in the rear of the vehicle, within the drive axle of the Mercedes Vito W639. As a rear axle and differential assembly, it is responsible for:

• mechanically connecting the driveshaft to the rear wheels,
• compensating for the difference in wheel rotational speed during cornering,
• bearing the loads resulting from the vehicle's curb weight and cargo.

This placement means the component operates under demanding conditions – it transfers high forces, is exposed to variable loads, and requires precise matching to the specific drivetrain version. Proper selection of the axle and differential is crucial for the durability of the entire drivetrain.

Benefits of using an original Mercedes differential

The axle with differential dedicated to the Mercedes Vito W639, sourced from the Mercedes brand, ensures factory-fit compatibility with suspension geometry, mounts, and drivetrain characteristics. Using an original solution allows for maintaining:

• compatibility with factory mounting points,
• correct driveshaft alignment,
• proper cooperation with suspension and braking system components.

This reduces the risk of improper fitment, excessive vibrations, or premature wear of other components. This is particularly important in vehicles used intensively, where parameter consistency and predictable maintenance costs are key.

Condition, origin, and practical application

The offered axle with differential is a used component, sourced from vehicle dismantling, which allows for cost-effective drivetrain repair while maintaining the manufacturer's original specifications. This type of component is particularly attractive in situations where:

• mechanical damage to the axle or differential has occurred,
• replacing the complete assembly is necessary instead of costly refurbishment,
• maintaining a specific 3.455 gear ratio is important.

Choosing a used, original component often helps shorten vehicle downtime and reduce costs compared to purchasing a new part, while maintaining compliance with factory design assumptions.

Gear ratio selection and additional technical materials

When replacing the axle with differential in a Mercedes Vito W639, it is crucial to match the gear ratio to the existing drivetrain configuration and the vehicle's usage style. It is worth considering how changing the gear ratio affects engine RPM, fuel consumption, and acceleration characteristics.

To better understand the relationships between axle ratio, differential, and vehicle operation, the guide article Dismantled drive axles and differentials – how to choose gear ratios for your driving style will be helpful, as it discusses definitions, gear ratio selection, configuration examples, and practical tips regarding used components.

Expanding repairs within the Mercedes rear drive system

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