Mercedes Vito W639 Rear Differential Diff Axle 3,273 Ratio A6393503214 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 an original drivetrain component from the Differentials category, designed for installation on the vehicle's rear axle. Thanks to its factory-spec design, it ensures proper torque transfer to the wheels and stable drivetrain operation in the Mercedes Vito W639. This is the ideal solution for users seeking a proven rear axle that meets factory specifications.

Specifications and technical data

• SKU: A6393503214
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6393503214
• Substitutable numbers: A6393503214, A 639 350 32 14, A 639 350 28 14, A6393502814
• Location on the vehicle: Rear
• Category: Differentials

Purpose and function in the drivetrain

The presented rear differential is responsible for distributing drive to the rear wheels and ensuring the correct gear ratio in the drive axle. The applied 3.273 ratio maintains the driving characteristics intended for the Mercedes Vito W639, which is significant for both vehicle dynamics and the loads transmitted through the gearbox and half-shafts.

Its placement on the rear axle means the component works directly with the suspension and braking system, making its correct selection crucial for vehicle stability, predictable road behavior, and even tire wear.

Benefits of using an original differential

Using an original differential in a Mercedes Vito W639 ensures:

• preservation of the factory drivetrain operating characteristics,
• proper compatibility with the existing gearbox and half-shafts,
• the correct gear ratio matched to the vehicle's weight and application,
• consistency with factory traction control and electronic stability programs.

For vehicles used in cargo transport or commercial services, this means more predictable behavior under load and a lower risk of drivetrain malfunctions. A used, original rear axle is often a sensible compromise between cost and maintaining factory performance parameters.

Application in Mercedes Vito W639 service and repairs

The rear differential with a 3.273 ratio is suitable for:

• replacing a worn or damaged drive axle,
• restoring factory parameters after unsuccessful gear ratio modifications,
• comprehensive rear axle rebuilds in a Mercedes Vito W639.

Selecting the correct gear ratio has a direct impact on engine RPM at a given speed, perceived dynamics, and acoustic comfort. A properly selected differential helps avoid excessive strain on the engine and gearbox, which translates into a longer service life for the entire system.

Condition, verification, and installation aspects

The offered item is sourced from dismantling and is classified as used, which in practice means that before installation, it is advisable to verify its operational condition according to workshop procedures (gear backlash, bearing condition, seal integrity). This type of differential is designed for installation in place of the factory rear axle, maintaining original mounting points and suspension geometry.

Before purchasing, it is recommended to compare the part's identification data and gear ratio with the unit currently installed in the vehicle to ensure full compatibility with the specific configuration of your Mercedes Vito W639.

Gear ratio selection and technical knowledge

If you want to better understand how the drive axle ratio affects driving characteristics, fuel consumption, and drivetrain loads, it is worth consulting reliable technical sources. A practical discussion of the topic, along with examples and answers to frequently asked questions, can be found in the article Dismantled drive axles and differentials – how to choose ratios for your driving style, which explains the principles of selecting a differential for specific applications in an accessible way.

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 additional axles, differentials, or complete rear axle assemblies, check the available parts in the Mercedes Differentials category.