The 2020 GM HD pickup trucks – the 2020 Chevrolet Silverado HD and 2020 GMC Sierra HD – deliver bold new designs, improved capabilities, new features and technologies. One feature that has gone underreported is that the 10-speed Allison transmission (which isn’t a pure Allison unit) mated to the 6.6L L5P turbo-diesel Duramax engine will offer an integrated Power Take-Off (PTO) as an option.
Power Take-Off (PTO)
Power Take-Off (PTO) is a device that transfers an engine’s mechanical power to the vehicle’s auxiliary components, most commonly a hydraulic pump. The feature is designed for customers who need to power other equipment with their trucks, mostly on the job site.
How It Works
2020 GM HD trucks will utilize a PTO that’s drive gear operated via a chain to direct engine power. Since PTO on the trucks is engine-driven rather than turbine-driven, owners can use the PTO while the vehicle is idling. A button inside the cab enables the PTO, and a mode selector allows adjustment of load and torque output.
The General says that the 2020 GM HD trucks will be the first in the HD truck segment to feature a fully integrated PTO system.
Both of the upcoming 2020 GM HD trucks will offer the all-new Power Take-Off feature. Availability will be as follows:
- 2020 Silverado HD: only available on Work Truck (WT) or LT models equipped with the 6.6-liter L5P Duramax diesel engine and 10-speed Allison transmission
- 2020 Sierra HD: only available on base Sierra (1SA) and SLE models equipped with the 6.6-liter L5P Duramax diesel engine and 10-speed automatic get the PTO feature.
It’s worth noting that the PTO feature is optional on models equipped with the 6.6L L5P Duramax and Allison 10-speed transmission. The 10-speed Allison without PTO is assigned RPO code MGM, while the 10-speed Allison with PTO is assigned RPO Code MGU.
We should also note that this feature will not be available at the start of the 2020 model year, as it is marked as “late availability.” In addition, it is not available with the new 6.6L V8 L8T gasoline engine, which is mated to GM’s 6-speed 6L90 transmission.
|Silverado 2500HD||Work Truck (1WT)||A – Requires (L5P) Duramax 6.6L Turbo-Diesel V8 engine and (K34) Cruise Control. Includes (MGU) 10-speed transmission|
|Silverado 2500HD/3500HD||Custom (1CX)||N/A|
|Silverado 2500HD/3500HD||LT (1LT)||A – Requires (L5P) Duramax 6.6L Turbo-Diesel V8 engine. Includes (MGU) 10-speed transmission|
|Silverado 2500HD/3500HD||LTZ (1LZ)||N/A|
|Silverado 2500HD/3500HD||Premier (3LZ)||N/A|
|Sierra 2500HD/3500HD||Base Sierra (1SA)||A – Requires (L5P) Duramax 6.6L Turbo-Diesel V8 engine and (K34) Cruise Control. Includes (MGU) 10-speed transmission.|
|Sierra 2500HD/3500HD||SLE (3SA)||A – Requires (L5P) Duramax 6.6L Turbo-Diesel V8 engine and (K34) Cruise Control. Includes (MGU) 10-speed transmission.|
|Sierra 2500HD/3500HD||SLT (4SA)||N/A|
|Sierra 2500HD/3500HD||AT4 (4SB)||N/A|
|Sierra 2500HD/3500HD||Denali (5SA)||N/A|
- N/A – Not Available
- A – Available
As such, the Power Take-Off (PTO) is exclusive to the lower trim levels of the 2020 Silverado HD and 2020 Sierra HD, namely the Silverado Work Truck and Custom models, along with the base Sierra and Sierra SLE models.
In addition to PTO, the new 10-speed transmission also features improved driveline components to better transfer the 6.6L Duramax’s 910 pound-feet of torque to the pavement. This allows more torque to be put to the ground in lower gears, enhancing overall driving dynamics and trailering performance, with smoother gear changes and shorter steps between them.
The new transmission, which is developed by GM and branded as Allison, also supports smart engine braking, which can help reduce brake wear. The Duramax/Allison combination’s standard axle ratio is lowered to 3.42:1, which reduces engine speed, giving the heavy duty powertrain a more refined feel at highway/expressway speeds.