Mercedes Vito W639 Rear Differential Diff Axle 3,273 Ratio A6393501414 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 3,273 Ratio is a complete rear drive axle with a differential, designed for the drive axle of the popular Mercedes Vito W639 generation commercial vehicle. The properly selected gear ratio ensures stable torque transmission, while the use of the original Mercedes design helps maintain predictable handling characteristics and proper cooperation with the drivetrain. This is a solution for users who expect proven, factory-spec geometry and a solid foundation for further vehicle operation.

Specifications and technical data

• SKU: A6393501414
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6393501414
• Substitutable numbers: A6393501414, A 639 350 14 14
• Location on the vehicle: Rear
• Category: Differentials

Purpose and function in the drivetrain

The offered differential axle is a component of the rear drive axle, responsible for torque distribution between the wheels and maintaining the correct gear ratio in relation to the transmission. The applied 3.273 ratio allows for a balance between acceleration dynamics and driving comfort at highway speeds, which is important in both cargo transport and fleet applications.

The placement on the rear axle promotes handling stability under load, and the axle design is adapted to the suspension characteristics and curb weight of the Mercedes Vito W639. This ensures correct half-shaft geometry, allowing the drivetrain to handle loads typical for commercial vehicles of this class.

Benefits of using an original differential axle

Using a complete differential axle with the correct gear ratio brings a number of practical benefits:

• Consistency with the factory configuration – maintaining the acceleration and engine speed characteristics intended by the manufacturer.
• Reduction of the risk of improper operation of systems cooperating with the drive, such as electronic stability control or traction control systems.
• The ability to restore proper drive operation after a failure or wear of the previous axle without the need to interfere with other components.

For workshops and fleet users, this means reduced vehicle downtime and predictable vehicle behavior after repair, which is significant during intensive use in local and long-distance transport.

Installation and operational characteristics

The differential axle for the Mercedes Vito W639 is a design intended for installation in the rear of the vehicle, replacing the factory axle drive unit. This solution allows for the restoration of the original drive line without the need for mounting modifications or interference with the load-bearing elements of the body, provided the selection is made in accordance with the vehicle version.

With proper installation and the use of appropriate consumables (gear oil with the specification recommended by the manufacturer), it is possible to achieve stable, repeatable operation of the final drive. The correct gear ratio also helps maintain optimal engine speeds at typical operating speeds, which can translate into smooth engine performance.

Application in service practice

This type of differential axle is particularly useful in situations where the existing unit has suffered mechanical damage, excessive wear, or requires a comprehensive replacement due to noise, play, or improper operation under load. Replacing the complete unit is often a more predictable solution than scattered repairs, as it limits the number of variables affecting the final service result.

For users who want to better understand gear ratio selection for driving style and operating conditions, a guide describing the principles of configuring drive axles and differentials will be helpful – a detailed discussion can be found in the article Dismantled drive axles and differentials – how to choose gear ratios for your driving style.

Expanding the drivetrain in a Mercedes

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