The General Motors 6T80 (or MHM) 6-speed automatic transmission was produced from 2012 to 2019 and was installed exclusively on the all-wheel-drive Cadillac XTS, designated Vsport. This automatic transmission is paired with the 3.6-liter twin-turbo LF3 engine and produces 500 Nm of torque.
Specifications
| Type | automatic transmission |
| Number of gears | 6 |
| Type of drive | all wheel |
| Engine volume, l | up to 3.6 |
| Torque output, Nm | up to 500 |
| Recommended oil | DEXRON VI |
| Oil capacity, liter | 9.0 |
| Partial replacement, liter | 5.0 |
| Maintenance | every 60 000 km |
| Gearbox lifespan, km | ~250 000 km |
| Weight, kg | 105 |
Gear ratios GM 6T80
Using the 2015 Cadillac XTS Vsport with a 3.6-liter turbo engine as an example:
| Main | 3.16 |
| 1st | 4.484 |
| 2nd | 2.872 |
| 3rd | 1.842 |
| 4th | 1.414 |
| 5th | 1.000 |
| 6th | 0.742 |
| Reverse | 2.882 |
Using
The transmission was installed on:
- Cadillac XTS I (P1LL) in 2012 – 2019.
Disadvantages of the GM 6T80 gearbox
- The automatic transmission belongs to the Gen 2 line and is unaffected by the problems of the first series automatic transmission;
- However, it’s worth noting that this transmission is combined with a particularly powerful unit;
- Therefore, active owners experience rapid wear of the torque converter lockup clutches;
- Then, wear debris clogs the valve body, causing jerking during shifting.
