Mercedes-Benz’s 7G-Tronic was the first seven-speed automatic transmission used in a production passenger car. Also known by the internal designation 722.9, it replaced the company’s five-speed 5G-Tronic in the early 2000s.
Mercedes-Benz introduced the transmission in autumn 2003 on several V8 models, including the E 500, S 430, S 500, CL 500, and SL 500. Its extra ratio allowed a wider spread between low gearing for acceleration and high gearing for quieter, more economical cruising. The torque-converter lock-up clutch could operate in all seven forward gears.
The name can cause confusion because “Tiptronic” describes a manual-shift function used by several manufacturers, not Mercedes-Benz’s specific seven-speed transmission. Dynaflow and PowerFlite were also automatic transmissions, but they belonged to earlier eras and used different designs. The 7G-Tronic was a longitudinal, torque-converter automatic with four planetary gearsets, four brakes, and three clutches.
The gearbox remained in production in several versions through 2020. Mercedes-Benz later moved to the nine-speed 9G-Tronic, but the seven-speed unit was an important bridge between traditional luxury-car automatics and today’s higher-ratio transmissions.