The 4-speed automatic transmission Mercedes 722.3 or W4A040 has been produced since 1981 and was installed only on large models of the German concern, that is, from E-Class and above. The transmission was combined with engines up to 6.0 liters and 570 Nm of torque.
This series includes: 722.3, 722.4, 722.5, 722.6, 722.7, 722.9, 725.0.
Specifications
| Production years | since 1981 |
| Type | automatic transmission |
| Number of gears | 4 |
| Type of drive | rear |
| Engine volume, l | up to 6.0 |
| Torque output, Nm | up to 570 |
| Recommended oil | DEXRON III or VI |
| Oil capacity, liter | 8.6 |
| Replacing the oil | every 75,000 km |
| Replacing the filter | every 75,000 km |
| Gearbox lifespan, km | ~300 000 |
Gear ratios Mercedes 722.3
Using the example of a Mercedes E-Class 1995 with a 3.2 liter engine:
| Main | 3.060 |
| 1st | 3.871 |
| 2nd | 2.247 |
| 3rd | 1.436 |
| 4th | 1.000 |
| Reverse | 5.586 |
The transmission was installed on:
- Mercedes E-Class W123 in 1981 – 1985; E-Class W124 in 1986 – 1996;
- Mercedes S-Class W126 in 1981 – 1991; S-Class W140 in 1992 – 1996;
- Mercedes SL R107 in 1981 – 1989; SL R129 in 1989 – 1995.
Disadvantages of the Mercedes 722.3 gearbox
- This automatic transmission is very reliable and problems appear after 200,000 km.
- Failures are caused by dirty oil or overheating due to a clogged radiator.
- More often than others, they repair the Reverse package, in which the springs are falling apart.
- Often the vacuum modulator in the gearbox is changed or the valve body is cleaned of dirt.
