The 2020 GMC Sierra HD has a commanding, powerful design rooted in a new architecture with larger proportions. It is taller and longer, with a more confident stance defined by a bold design that epitomizes GMC's signature refinement and technologically driven attention to detail. The all-new Sierra HD is highlighted by new signature lighting, including prominent "light blades" that deliver LED illumination for the daytime running lamps. LEDs are also used for the headlamps, taillamps, available fog lamps and other illuminative elements, including the available roof marker lights standard on all dual-rear-wheel HDs and all Sierra HD Denalis except where prohibited by law. Inside, the Sierra HD's new interior has best-in-class front head- and legroom (maximum), with Crew Cab models. A higher seating position complements the truck's taller profile to offer a confident view from behind the wheel. Additional optimized ergonomics emphasize easy, intuitive interaction with the vehicle's available technologies, such as a heavy-duty segment-first head-up display and GMC's latest touchscreen infotainment systems. Denali-exclusive materials - including premium leather-appointed seating, authentic open-pore wood trim and dark-finish aluminum decor - raise the interior's refinement. The leather appointments have a distinctive, large-pebbled grain with a contrasting stitch pattern that is premium in appearance and touch without sacrificing durability, and the wood trim features an open-pore texture evocative of hand-planed furniture.
All-new Sierra AT4 HD: Refined HD Capability Off-Road
The all-new 2020 Sierra Heavy Duty AT4 continues the AT4 brand's growth with a distinctive off-road identity to complement its robust HD capability. Driven by dark chrome exterior finishes and contemporary detailing, Sierra HD AT4 features front and rear bumpers and a grille surround finished in body color. The bold grille design, with its rugged texture, is finished in black chrome and set off by the AT4's distinctive red vertical recovery hooks. The athletic interior also carries AT4-specific darkened trim, including dark-tinted and textured aluminum finishes on the steering wheel, center stack and sill plates, as well as a unique Jet Black interior with Kalahari color accents in the seats and live stitching. Leather-appointed seating, with mini-perforated inserts and embroidered AT4 badging on the headrests, along with all-weather floor liners, is standard delivering durability with uncompromising comfort.
Confident trailering power
GMC's legendary Duramax turbo diesel and Allison Transmission pairing continues to offer the ultimate in towing confidence. The proven Duramax 6.6L turbo-diesel engine offers high torque, high power, low noise and exceptional durability. For the 2020 Sierra HD, the Duramax offers an SAE-certified 445 horsepower and 910 lb-ft of torque. This already powerful engine performs more efficiently thanks to increased cooling capacity delivered in part by improved air induction. A dual-path intake system draws dense, cool air through both the prominent hood scoop and the larger front grille. The new Sierra HD marks the introduction of an all-new 10-speed Allison automatic transmission - the first-ever offered in the heavy-duty pickup segment. The all-new 10-speed transmission with closer gear spacing allows the engine to operate in an optimal range at all times with varying load and terrain conditions. The bigger frame, stronger propulsion and smarter technologies are expected to deliver dramatically greater towing capacity than previous models, well in excess of 30,000 pounds.
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