Mercedes-Benz Vito W639 Rear Differential Diff 3,455 Ratio A6393501314 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 3,455 Ratio is a complete rear final drive unit designed for the driven axle of the W639 generation Vito model. The appropriate I=3,455 gear ratio ensures balanced traction parameters, stable drivetrain operation, and predictable vehicle behavior in daily use. This is a solution for users who expect a proven, factory-spec component with predictable performance characteristics.

Specifications and technical data

• SKU: A6393501314
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6393501314
• Substitutable numbers: A6393501314, A 639 350 13 14
• Location on the vehicle: Rear
• Category: Additional Differential Parts

Purpose and function of the rear differential

The offered differential is a component of the rear drivetrain, responsible for transferring torque from the driveshaft to the wheels and compensating for the difference in wheel rotational speeds during cornering. The applied I=3,455 gear ratio affects acceleration characteristics, engine RPM during highway driving, and the overall refinement of the drivetrain.

Its location at the rear of the vehicle allows for direct integration with the suspension and half-shafts, which is crucial for handling stability, especially in a commercial vehicle such as the Mercedes-Benz Vito W639.

Benefits of using the correct I=3,455 gear ratio

Selecting a differential with the correct gear ratio is crucial for maintaining the vehicle's factory specifications. The I=3,455 ratio allows you to:

• maintain the acceleration and flexibility characteristics intended by the manufacturer,
• preserve optimal engine RPM at constant speeds, which promotes fuel economy,
• limit excessive stress on other drivetrain components,
• minimize the risk of malfunctions in electronic systems linked to the drivetrain.

For vehicles used in cargo transport or service operations, the correct differential ratio translates into predictable fuel consumption and stable behavior under load.

Product characteristics and installation

The differential for the Mercedes-Benz Vito W639 belongs to the Other differential parts group, meaning it is a specialized component strictly tied to a specific drivetrain configuration. Its location at the rear of the vehicle requires precise installation, correct alignment, and inspection of the seals connecting to the half-shafts and driveshaft.

Before installation, it is recommended to:

• verify the gear ratio compatibility with your vehicle's configuration,
• check the condition of mounts and mating components,
• use the appropriate transmission oil in accordance with the vehicle manufacturer's recommendations.

Proper installation reduces the risk of noise, vibrations, and premature wear of the transmission.

Using a pre-owned differential in vehicle maintenance

Using a pre-owned differential in a Mercedes-Benz Vito W639 is a solution often chosen for post-accident repairs, mechanical transmission damage, or excessive wear of the ring and pinion gears. A properly selected component allows for restoring correct drivetrain operation at a lower cost than purchasing a new part.

If you are considering whether an original part, a replacement, or a used part is the better choice for your situation, an article describing the differences in costs, quality, and matching by OEM numbers may be helpful – check out the material: Original, replacement, or used – which car parts are the most cost-effective?.

In the context of rising service costs, it is also worth reading practical tips on optimizing repair expenses, including those for drivetrain components – more information can be found in the guide: Rising repair costs and the boom in used parts – how to save on car maintenance?.

Expanding rear drivetrain repairs in a Mercedes

If you are planning a comprehensive repair or upgrade of the rear axle drivetrain in your Mercedes and need other items from the same group, such as differential housings, mounting hardware, or additional transmission components, check out the available parts in the Other Mercedes differential parts category.