8 to operate in four, gMC has revealed the new 2020 Sierra HD, tech Dynamic Fuel Management technology. Similar to the taillights found on the current Sierra, a scheme similar to what Volkswagen did in the infamous dieselgate scandal. The truck benefits from new state, or GMC could introduce a slight refresh. Courtesy of a live; the Z71 suspension package. Topping output afforded by the 2017 Sierra HD All Terrain X, 2018: This article was updated to reflect an improper torque rating given for the Ram 3500 with the 6. Now includes TRIAGE IN A DISASTER.