The Mercedes 722.4 (W4A020) is a 4-speed Automatic transmission with manual shift function. From 1981 to 1996 this gearbox was installed in some Mercedes-Benz models. It is also known as 4G-Tronic and is known for its reliability.
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How the Mercedes 722.4 (W4A020) works
The Mercedes 722.4 (W4A020) is a standard automatic transmission with a hydraulic torque converter and planetary gear sets. The driving mode is selected by moving the shift lever to the appropriate position. In “D” mode, all four gears are used. This position is recommended for normal driving situations. Once the lever is placed in the “3” position, gear shifting is limited to the first three gears, which is optimal for long, gradual climbs and descents. In “2” mode, only first and second gears can be used, which allows the car to cope with steep slopes, especially when towing a trailer. The “B” mode allows engine braking.
The technical details of the Mercedes 722.4 (W4A020)
| Indexc | number of gears | Max. Engine torque, N m | Max. Displacement, l | Type of drive | Engine layout | Models |
| 722.4 | 4 | 250 | 3.0 | Rear wheel | Longitudinal | E-Class W123; S Class W126; C Class W202; E-Class W124 |
Common defects of the Mercedes 722.4 (W4A020)
- The hydraulic valve body pipes clog over time.
- The vacuum modulator sometimes does not work.
- Sometimes the clutch springs break.
- The Teflon O-rings of the hydraulic valve body and transmission pump often leak.