Mercedes-Benz Vito W639 Rear Differential Diff 3,72 Ratio A6393501214 WARRANTY

Listing details

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

Mercedes-Benz Vito W639 Rear Differential Diff 3,72 Ratio is a rear drive unit designed for the driven axle, ideal for professional repair or replacement of a worn differential in your Vito. The correct axle ratio ensures predictable vehicle behavior, stable traction, and consistent drivetrain performance. By choosing this component from the Differentials category, you are opting for a solution structurally matched to the specifics of the rear-wheel drive in a Mercedes.

Specifications and technical data

• SKU: A6393501214
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6393501214
• Substitutable numbers: A6393501214, A 639 350 12 14
• Location on the vehicle: Rear
• Category: Differentials

Purpose and function in the drivetrain

The differential axle in a Mercedes-Benz Vito W639 is responsible for transferring torque from the driveshaft to the rear wheels and compensating for the difference in wheel rotational speeds during cornering. Its location on the rear axle means this component operates under demanding load conditions, which is why its technical condition directly affects the smoothness of the drivetrain, noise levels, and the durability of other components.

Selecting a differential with the correct ratio is crucial for maintaining factory acceleration characteristics, engine RPM during highway driving, and proper interaction with the vehicle's electronics. This axle is structurally prepared for integration with the Vito W639 drivetrain, which facilitates installation and reduces the risk of compatibility issues.

Benefits of using a rear differential axle

Using a complete differential axle to replace a damaged or excessively worn component allows you to restore the proper operation of the rear-wheel drive in a single step. In practice, this means:

• reduction of unwanted noise and vibrations coming from the rear axle,
• stable torque transfer to the wheels,
• proper interaction with traction control and safety systems,
• reduced risk of secondary damage to the driveshaft, half-shafts, and wheel bearings.

For workshops and fleet users, this is a solution that shortens vehicle downtime and simplifies the service process – instead of extensive regeneration of multiple elements, a complete rear drive unit is installed.

Product characteristics and condition

The offered differential axle comes from a Mercedes vehicle and is a part from the Differentials group. The product is used, which in practice means that standard workshop verification is recommended before installation – checking for play, leaks, and potentially refreshing consumables (gear oil, seals). This approach allows you to maximize the potential of the part and ensure long-lasting, stable operation of the rear-wheel drive.

The vehicle placement marked as Rear clearly indicates that this is a component intended for the rear driven axle. This gives the mechanic clarity regarding its application and allows for precise planning of installation work, including removing the old axle, checking mounts, and setting the rear axle geometry after the repair is completed.

Ratio selection and compatibility with the Vito W639

In a Mercedes-Benz Vito W639, choosing the right differential is important not only for driving dynamics but also for the proper operation of the transmission and electronic systems. The axle ratio affects:

• engine RPM at a constant speed,
• vehicle response to acceleration,
• subjective feeling of drivetrain flexibility,
• fuel consumption under typical operating conditions.

To better understand how to choose an axle and differential for a specific driving style and vehicle configuration, it is worth consulting a specialist guide. Practical tips, configuration examples, and an explanation of the relationship between the ratio and vehicle behavior can be found in the article Dismantled drive axles and differentials – how to choose ratios for your driving style.

Support for drivetrain expansion

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, driveshafts, or half-shafts, check out the available parts in the Mercedes Differentials category.

For users who are simultaneously considering a larger scope of work on the powertrain – e.g., replacing or overhauling the engine unit – a guide describing the key stages of verifying used components may also be helpful. Before deciding to purchase an engine, it is worth reading the material Buying a used engine: 5 things you must check before installation to better plan your entire service investment.