The AMG SpeedShift TCT 7 7-speed automatic transmission was produced in Germany from 2004 to 2015 and was installed in high-performance versions of the second- and third-generation SLK 55 roadster. This transmission is a variant of the 722.9 automatic transmission and is also known as the 7G-Tronic Sport.
Specifications
| Type | automatic transmission |
| Number of gears | 7 |
| Type of drive | rear |
| Engine volume, l | up to 5.5 |
| Torque output, Nm | up to 700 |
| Recommended oil | ATF MB 236.14 / 236.15 |
| Oil capacity, liter | 9.7 |
| Partial replacement, liter | 9.0 |
| Maintenance | every 30 000 km |
| Gearbox lifespan, km | ~300 000 km |
| Weight, kg | 85 |
Gear ratios Mercedes AMG SpeedShift TCT 7
Using the example of a 2007 Mercedes SLK 55 AMG with a 5.5 liter engine:
| Main | 3.06 |
| 1st | 4.377 |
| 2nd | 2.859 |
| 3rd | 1.921 |
| 4th | 1.368 |
| 5th | 1.000 |
| 6th | 0.820 |
| 7th | 0.728 |
| Reverse | 3.416 |
Using
The transmission was installed on:
- Mercedes SLK-Class R171 in 2004 – 2010;
- Mercedes SLK-Class R172 in 2012 – 2015.
Disadvantages of the Mercedes AMG SpeedShift TCT 7 gearbox
- First of all, this is a very rare automatic transmission, and its failure rate is extremely low;
- It’s important to monitor the cooling system, as this automatic transmission does not tolerate overheating;
- High temperatures significantly reduce the lifespan of the control board, which is expensive;
- It’s also important to change the oil regularly, otherwise the valve body will become clogged with wear debris;
- However, the main problem for owners is the lack of service and spare parts.
