V-CLASS Transmission Parts & MERCEDES-BENZ Aftermarket

The differences in V-Class transmission parts across different model years mainly involve transmission types, technological upgrades, electronic control systems, and compatibility with various powertrains. Below is a breakdown of the key differences across different V-Class generations:

1. W638 Generation (1996-2003)

• Equipped with 5-speed manual transmissions and 4-speed automatic transmissions (722.4 series).
• The automatic transmission relied on a hydraulic torque converter, with a relatively simple shifting logic and fewer control units.
• Mostly mechanical components with minimal electronic integration, making repairs relatively straightforward.

2. W639 Generation (2003-2014)

• Introduced 6-speed manual transmissions and 5-speed automatic transmissions (722.6 series).
• The 722.6 automatic transmission improved shifting smoothness and included an adaptive learning function.
• Enhanced cooling systems increased durability.
• Transmission Control Modules (TCM) became more sophisticated, reducing shift shocks and improving fuel efficiency.

3. W447 Generation (2014-2023)

• Featured 7-speed automatic transmissions (7G-Tronic, 722.9 series) and 6-speed manual transmissions.
• 7G-Tronic offered higher transmission efficiency, manual and sport modes.
• Further upgraded electronic control systems, integrating Start-Stop technology for fuel savings.
• Expanded torque converter lock-up range, enhancing fuel economy and driving smoothness.
• Transmission components, such as valve bodies, control units, and oil pumps, used advanced materials for greater durability.

4. W448 Generation (2024-Present)

• Upgraded to the 9-speed automatic transmission (9G-Tronic, 725.0 series).
• 9G-Tronic employs an advanced planetary gear design for smoother shifts and better fuel efficiency.
• Enhanced Transmission Control Unit (TCU) supports multiple driving modes and smart driving assistance.
• Key components, including clutch plates and hydraulic systems, have been optimized for reduced wear and longer lifespan.
• Designed to support mild-hybrid and plug-in hybrid powertrains, with some variants featuring an electric drive unit (eATS).

Summary

The evolution of V-Class transmission parts primarily reflects increased gear ratios, improved electronic control systems, and enhanced energy efficiency. Early models (W638, W639) relied on 4-speed and 5-speed transmissions, while later generations (W447, W448) transitioned to 7-speed and 9-speed transmissions, with enhanced electronic controls, intelligent driving features, and hybrid compatibility. Key transmission components—such as TCUs, torque converters, clutch plates, and oil pumps—have undergone continuous optimization, improving durability and overall driving performance.