Mercedes-Benz 722.9 7G-Tronic Plus Automatic Transmission Teardown

The name “7G-Tronic” is Mercedes-Benz’s trademark name for its seven-speed automatic transmission which starts with the W7A 700 and W7A 400 as core models. The Mercedes 7G-Tronic 722.9 transmission is the fifth generation of their transmission line, and it is used in everything from the top of the line Mercedes S-Class, all the way down to the Mercedes C-Class. It has seven forward gears and two reverse gears, which are created by 2 simple planetary gearsets, and 1 Ravigneaux gearset. The 722.9 transmission has four multi-disc brakes and three multi-disc clutches, which give it the ability to drop multiple gears in a single downshift.

Introduced in the fall of 2010, the Mercedes 722.9 7G Tronic Plus transmission was the next evolution of the brand’s 7-speed automatic transmission which improved the transmission’s design so as to better withstand the torque of more modern turbocharged engines as well as be compatible with engine start/stop systems. Along with a number of smaller improvements, the biggest improvement was a new 722.9 torque converter that featured a unique damping system that can better handle the torque and vibration better than the previous generation.

TransTec Products for 722.9 7G-Tronic Automatic Transmission