Mercedes W140 Torque Converter Automatic Transmission Gearbox 722620 A1402500402

Mercedes W140 R129 Torque Converter Automatic Transmission Gearbox is a specialized component from the Torque Converters group, designed for diesel engine powertrains. The offered sub-assembly is an original Mercedes component, designed to work with the automatic transmission in W140 and R129 series vehicles.

Specifications and technical data

• SKU: A1402500402
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1402500402
• Substitutable numbers: A1402500402, A 140 250 04 02
• Fuel type: Diesel
• Gearbox type: Automatic
• Category: Torque Converters

Purpose and function in the powertrain

The torque converter in Mercedes W140 and R129 models is responsible for the correct transfer of torque between the diesel engine and the automatic transmission. In combination with the transmission control system, it ensures stable starting, smooth acceleration, and proper damping of torsional vibrations across the entire rev range. This element is particularly important in vehicles with diesel units, where high torque requires a precisely matched operating characteristic. The use of a dedicated torque converter allows for maintaining factory drive performance parameters, reducing jerking during gear changes, and improving the overall refinement of the system.

Benefits of using an original torque converter

Using an original torque converter in a Mercedes W140 or R129 with a diesel engine and automatic transmission translates into measurable operational benefits:

• maintaining compliance with the factory transmission operating characteristics,
• better cooperation with the automatic transmission control system,
• stable transfer of the high torque of the diesel unit,
• reducing the risk of improper transmission operation resulting from the use of mismatched replacements. For users who value predictable vehicle behavior and comfortable gear shifting, choosing such a component is a safe and technically justified solution.

Installation and operational characteristics

The torque converter is designed to work with the automatic transmission in Mercedes W140 and R129 vehicles powered by diesel fuel. Thanks to maintaining the original design specification, it is possible to match it to the factory powertrain without the need for interfering with mounting geometry or additional modifications. When selecting the element, it is crucial to compare the markings with the vehicle documentation and the existing transmission, which helps avoid compatibility issues. A properly selected torque converter supports stable operation of the automatic transmission, which is important for both the durability of the transmission and driving comfort.

Application in Mercedes vehicles with diesel engines

Mercedes W140 and R129 powertrains with diesel engines are characterized by high torque from low revs, which places special demands on elements from the Torque Converters group. A properly selected torque converter allows for:

• effective use of the diesel unit's characteristics,
• reduction of dynamic loads acting on the transmission,
• more predictable vehicle behavior in urban and highway conditions. As a result, the driver receives a coherent, comfortable powertrain that better withstands the long-term operation typical of luxury class cars.

Powertrain expansion and selection of related elements

If you are planning a comprehensive repair or upgrade of the drivetrain area in your Mercedes and need other elements from the same group, such as torque converters, control elements, or additional transmission sub-assemblies, check the available parts in the Mercedes Torque Converters category. To better plan your purchases and select a coherent set of used components, it is worth familiarizing yourself with practical tips on completing sub-assemblies – the article Comprehensive supply: from the engine to the smallest clip – how to complete used car parts in one place? will be helpful, which discusses the advantages of the One-Stop-Shop approach and the importance of choosing original elements instead of random replacements.