397-horsepower 6.6-liter Duramax diesel is part of the package.
General Motors has unveiled the 2015 Chevy Silverado and GMC Sierra heavy duty trucks in the ute-loving state of Texas, ahead of going on sale early next year. GM is offering buyers a choice of two engines: a Vortec 6.0-liter V8 rated at 360 hp and 380 lb-ft in the 2500HD and 322 hp and 380 lb-ft in the 3500HD, and a 6.6-liter Duramax turbodiesel V8 rated at 397 hp and 765 lb-ft of torque. The stock V8 can be run on gasoline, E85 FlexFuel or CNG, and is paired with GM's six-speed Hydra-Matic, while the Duramax is mated to a six-speed Allison automatic.
GM's HDs boast a class-leading payload capacity of 7,374 pounds and conventional trailering rating of 19,600 pounds, while with an optional fifth-wheel hitch this is boosted to 23,200 pounds. Over 150 configurations are also on offer, including three cabs, two cargo bed lengths, a choice of single- and dual-rear wheels (on the 3500) and a range of trim levels. In terms of styling the heavy duty trucks ape that of the 1500 counterparts save for a larger grille, power dome hood and one-piece chrome front bumper. At the back the HD trucks also get a rear corner step bumper and EZ Lift-and-Lower tailgate.
The DRW models comes with a one-piece bed design incorporating fender extensions. In the range-topping Denali trim, the Sierra HD comes with LED-infused headlights, unique grille design, body-color bumpers, polished stainless-steel exhaust tips, leather upholstery, heated and cooled front seats, a Bose sound system, and GPS infotainment. Pricing details have yet to be revealed.