The new GM 10-speed automatic transmission is now either standard or an option on GM’s full-size SUVs. In these applications, the new 10-speed is known as the Hydra-Matic 10L80 and is assigned GM RPO code MF6.
Developed in partnership with Ford, the gearbox represents an all-new design and features a rather wide 7.39 overall gear ratio spread, enabling the 6.2-liter L86 V8 EcoTec3 engine with which it’s normally paired to deliver a more immediate feeling of power, performance, and smoothness.
The new transmission has a host of advantages over the 6-speed it replaced in the Tahoe/Suburban as well as the (universally-loathed) 8-speed it replaced in the Yukon Denali and Escalade. So, here are its top ten benefits of the transmission, as per GM.
1. Improved Efficiency
With the wider overall ratio spread, GM’s new 10-speed unit enables a lower numerical top gear ratio, which results in reduced engine speed on the highway and greater overall efficiency.
2. Quicker Shifts
The 10L80’s quick shifts help 6.2-liter V8 L86 engine, rated at an SAE-certified 420 horsepower and 460 pound-feet of torque, to achieve a more immediate feeling of performance, as the perfect gear is available whenever the driver tips into the engine’s power reserve. In other words, merging onto the highway or passing is a breeze despite the weight of these full-sizers.
3. Precise And Smooth Shift Feel
Shorter steps between gears along with proprietary controls provide a quick, seamless shifting experience, thereby making the new transmission more efficient in each of its gears than the six- and eight-speed units the 10L80 replaces.
4. Fuel Efficiency
The wider overall ratio enables a lower numerical top gear ratio, thereby delivering greater fuel efficiency in comparison to its six- and eight-speed predecessors. In addition, the 10-speed features lower friction, further adding to improved fuel efficiency.
5. Same Size, Double The Power
With so much packed into the 10L80, it may come as a surprise that there is no significant increase in overall unit size. In fact, the 10-speed has approximately the same physical dimensions as the six- and eight-speed transmissions before it, thereby minimizing changes to vehicle interfaces.
6. Two Hydraulic Pumps
As the clutches in an automatic transmission are hydraulically actuated and controlled, the new 10-speed relies on two special pumps to provide the necessary hydraulic muscle.
7. Reduced Spin Losses
The 10-speed has several friction-reducing design features, including all-new ultra-low viscosity transmission fluid, internal thermal bypass, a minimal number of non-applied clutches and various other lower elements that minimize mechanical spin losses. The result is a positive impact on vehicle efficiency.
8. Transmission Fluidity
The new 10-speed transmission enables the fluid to reach a viscosity of 4.5 centistokes, thereby significantly reducing friction and the workload for the hydraulic pumps.
9. Wider Gear Ratio Speed
The 10L80 has a wide spread of ratios between the first and the tenth gear. Increasing the size of the gear to 7.3 allows for a smoother run and for the car to stay in the selected gear for longer when driving on the highway.
10. GM Control System
World-class shift time quickness and responsiveness are accomplished by leveraging the base transmission hardware in concert with GM’s exclusively-developed algorithms, software and calibrations. An externally mounted electronic control module executes millions of instructions every second.
The 10L80 represents the first-ever application of a 10-speed transmission in GM SUVs. Availability varies by model year and model, but the unit is standard on the 2019 model year Cadillac Escalade, GMC Yukon Denali and Yukon Denali XL, Chevy Tahoe with the RST Performance Edition as well as the Suburban RST Performance Edition.
GM 10L80 10-Speed Automatic Transmission Availability & Applications
|2018||General Motors Company||Chevrolet||Tahoe||6.2L V8 L86 EcoTec3||Hydra-Matic 10L80 MF6||New on Tahoe RST Performance Edition|
|2019||General Motors Company||Chevrolet||Suburban||6.2L V8 L86 EcoTec3||Hydra-Matic 10L80 MF6||New on Suburban RST Performance Edition|
|2018||General Motors Company||GMC||Yukon Denali||6.2L V8 L86 EcoTec3||Hydra-Matic 10L80 MF6||Replaces 8-speed automatic M5U|
|2018||General Motors Company||GMC||Yukon Denali XL||6.2L V8 L86 EcoTec3||Hydra-Matic 10L80 MF6||Replaces 8-speed automatic M5U|
|2018||General Motors Company||Cadillac||Escalade||6.2L V8 L86 EcoTec3||Hydra-Matic 10L80 MF6||Replaces 8-speed automatic M5U|
|2018||General Motors Company||Cadillac||Escalade ESV||6.2L V8 L86 EcoTec3||Hydra-Matic 10L80 MF6||Replaces 8-speed automatic M5U|