The Mercedes 700.4 7-speed preselective robotic transmission, or AMG SpeedShift DCT, has been produced since 2009 and is installed exclusively in the German company’s most powerful supercars, such as the SLS and AMG GT. This robotic transmission is simply a modification of the Italian Getrag 7DCL750.
Specifications
| Type | preselective robotic transmission |
| Number of gears | 7 |
| Type of drive | rear / all wheel |
| Engine volume, l | up to 6.2 |
| Torque output, Nm | up to 800 |
| Recommended oil | MB 236.25 + MB 236.26 |
| Oil capacity, liter | 8.7 + 4.0 |
| Partial replacement, liter | 7.2 + 3.3 |
| Maintenance | every 50 000 km |
| Gearbox lifespan, km | ~250 000 km |
| Weight, kg | 136 |
Gear ratios Mercedes AMG SpeedShift DCT
Using the 2012 Mercedes SLS AMG with a 6.2-liter engine as an example:
| Main | 3.67 |
| 1st | 3.397 |
| 2nd | 2.186 |
| 3rd | 1.626 |
| 4th | 1.285 |
| 5th | 1.029 |
| 6th | 0.839 |
| 7th | 0.720 |
| Reverse | 2.79 |
Using
The transmission was installed on:
- Mercedes AMG GT-Class C190 in 2014 – …;
- Mercedes SLS-Class C197 in 2009 – 2014.
Disadvantages of the Mercedes AMG SpeedShift DCT gearbox
- This is a fairly rare transmission for supercars, and information on its failures is limited;
- Oil leaks, especially at the input shaft seal, are actively discussed on specialized forums;
- Furthermore, this problem isn’t limited to the SLS; it has gradually migrated to the AMG GT as well;
- Also, active owners replace the clutch as early as 50,000 km, which is not cheap;
- Don’t forget to renew the lubricant in both the hydraulic and mechanical parts of the transmission.
