General Motors’ series of Hydra-Matic 10-speed automatic transmissions, internally referred to as 10LXX, was developed for use in rear-wheel-drive or rear-biased all-wheel-drive vehicles.
The 10LXX moniker is decoded as follows:
- 10, for 10 forward gears
- L, for longitudinal placement within the vehicle’s powertrain system
- 90, for the unit’s robustness (a higher number, such as 90, means that it is capable of handling more power compared to a 10L45)
Vehicles equipped with the 10LXX transmission benefit from higher fuel economy and performance when compared to the Hydra-Matic 8-speed 8LXX and Hydra-Matic 6-speed 6LXX transmissions it will replace during its lifecycle.
The improved performance is the result of smaller steps between each ratio, maximizing engine power under acceleration, while a wide 7.39 overall gear ratio spread and a lower numerical top gear ratio results in improved efficiency by reducing engine revolutions at highway speeds.
| Transmission: | 10-speed 10LXX | 8-speed 8LXX |
|---|---|---|
| Gear ratios (:1) | ||
| First: | 4.70 | 4.56 |
| Second: | 2.99 | 2.97 |
| Third: | 2.15 | 2.08 |
| Fourth: | 1.80 | 1.69 |
| Fifth: | 1.52 | 1.27 |
| Sixth: | 1.28 | 1.00 |
| Seventh: | 1.00 | 0.85 |
| Eighth: | 0.85 | 0.65 |
| Ninth: | 0.69 | – |
| Tenth: | 0.64 | – |
| Reverse: | 4.87 | 3.82 |
We will update this section with more detailed specs on GM’s Hydra-Matic 10LXX 10-speed transmission family specs as they become available.
The Hydra-Matic 10LXX 10-speed automatic transmission family will consist of various 10-speed automatic transmissions with different power and torque ratings. At the present time, it is not clear what the variants will be or what they will be called.
However, we know that the high-performance/heavy-duty variant of the GM 10-speed transmission — the 10L90 — has been assigned GM RPO code MX0.
| Transmission | Transmission RPO Code |
|---|---|
| 10L90 | MX0 |
| 10L80 | ? |
| Unknown | unknown |
In March 2016, General Motors announced that it will introduce the new 10-speed transmission across eight vehicle models by the year 2018. We expect these vehicles to be:
- Chevrolet Silverado
- GMC Sierra
- Cadillac ATS replacement, which will possibly be called Cadillac CT3
- Cadillac CTS replacement, which will possibly be called Cadillac CT5
- Cadillac CT6
- Cadillac Escalade
- Chevrolet Corvette
- Chevrolet Camaro (non-ZL1 models)
- Chevrolet Tahoe
- Chevrolet Suburban
- GMC Yukon and Yukon XL
The 10LXX transmission family was officially announced in April 2016 in conjunction with the sixth-generation 2017 Camaro ZL1, with (what is believed to be) the 10L90 unit used in the 2017 Camaro ZL1 being the first 10-speed automatic transmission for a volume production car. A year later, it was announced that the 2018 Chevrolet Tahoe with the Performance Package will also use the transmission.
| Transmission | Transmission RPO Code | Vehicle Application | Horsepower Capacity | Torque Capacity |
|---|---|---|---|---|
| 10L90 | MX0 | 2017 Chevrolet Camaro ZL1 Coupe | 650 | 650 |
| 10L90 | MX0 | 2017 Chevrolet Camaro ZL1 Convertible | 650 | 650 |
| 10L80 | - | 2018 Chevrolet Tahoe Performance Package | 420 | 460 |
The Hydra-Matic 10LXX transmission family was developed in collaboration with the Ford Motor Company.
The 10L80 transmission is produced at the GM Powertrain facility in Romulus, Michigan.
