The GM-Allison 10L1000 10-speed automatic transmission has been produced since 2019 and is installed in rear-wheel drive pickup trucks under the MGM name, in all-wheel drive pickups under the MGU name. This transmission is also installed in the Chevrolet Silverado, GMC Sierra with the 6.6-liter Duramax V8 diesel engine.
Specifications
| Type | automatic transmission |
| Number of gears | 10 |
| Type of drive | rear / all wheel |
| Engine volume, l | up to 6.6 |
| Torque output, Nm | up to 1400 |
| Recommended oil | DEXRON ULV |
| Oil capacity, liter | 13.6 |
| Partial replacement, liter | 7.5 |
| Maintenance | every 60 000 km |
| Gearbox lifespan, km | ~250 000 km |
| Weight, kg | 163 |
Gear ratios GM 10L1000
Using the 2021 Chevrolet Silverado 2500HD with a 6.6-liter diesel engine as an example:
| Main | 3.42 |
| 1st | 4.54 |
| 2nd | 2.87 |
| 3rd | 2.06 |
| 4th | 1.72 |
| 5th | 1.48 |
| 6th | 1.26 |
| 7th | 1.00 |
| 8th | 0.85 |
| 9th | 0.69 |
| 10th | 0.63 |
| Reverse | 4.54 |
Using
The transmission was installed on:
- Chevrolet Silverado 4 (GMT1RC) in 2019 – …;
- GMC Sierra 5 (GMT1RG) in 2019 – …
Disadvantages of the GM 10L1000 gearbox
- The torque converter locks up in first gear, and its clutch has a short lifespan;
- The torque converter’s weak points also include its short-lived stator;
- During vigorous driving, wear debris from the torque converter clutch quickly clogs the valve body;
- This dirt also significantly reduces the lifespan of the oil pump, so change the lubricant more frequently;
- The original stamped oil pan often warps from overheating and leaks.
