The 8-speed Mazda MM8AX-EC automatic transmission has been produced by the Japanese company only since 2022 and is installed in the company’s most popular crossovers, the CX-60, CX-70, and CX-90. It’s a hydromechanical automatic transmission, but it features a multi-plate clutch instead of a torque converter.
Specifications
| Type | automatic transmission |
| Number of gears | 8 |
| Type of drive | all wheel |
| Engine volume, l | up to 3.3 |
| Torque output, Nm | up to 550 |
| Recommended oil | Mazda ATF-A7 |
| Oil capacity, liter | 8.3 7.3 in 2024 manuals |
| Partial replacement, liter | 5.0 |
| Maintenance | every 60 000 km |
| Gearbox lifespan, km | ~250 000 km |
Gear ratios Mazda MM8AX-EC
Using the 2024 Mazda CX-60 with a 3.3 diesel engine as an example:
| Main | 3.307 |
| 1st | 4.912 |
| 2nd | 3.200 |
| 3rd | 2.168 |
| 4th | 1.729 |
| 5th | 1.290 |
| 6th | 1.000 |
| 7th | 0.807 |
| 8th | 0.650 |
| Reverse | 4.163 |
Using
The transmission was installed on:
- Mazda CX-60 I (KH) in 2022 – …;
- Mazda CX-70 I (KJ) in 2024 – …;
- Mazda CX-90 I (KK) in 2023 – …
Disadvantages of the Mazda MM8AX-EC gearbox
- This automatic transmission hasn’t been around very long, but it’s already been plagued by a number of serious issues;
- There was even a recall campaign due to loss of power after a sudden stop;
- Owners also report strong vibrations in a certain RPM range;
- The driveshaft is usually replaced under warranty, but this doesn’t help everyone; the problem is the transmission;
- There are also complaints on specialized forums about poor gear shifting at low speeds.
