The grille treatment on the 2020 GMC Sierra HD SLT will be notably different from its light duty counterpart. While the all-new, 2019 Sierra 1500 SLT features a unique grille design with “open slats” interrupted by the GMC logo, the new 2020 Sierra HD SLT will feature a similar design, but one with three prominent horizontal bars without any interruptions in the horizontal slats. In order to not completely give away the identity of the vehicle for obvious reasons, the prototype shown here is not wearing the GMC logo.
Other elements captured by the spy photos include a full-LED headlight cluster as well as an absence of fog lamps mounted on the bumper, signifying that the headlights make sufficient light in order to handle primary and secondary (fog lamp) lighting duties.
The SLT trim slots just below the Denali in the GMC model hierarchy. Additionally, the light duty Sierra SLT derives the off-road-oriented AT4 trim.
The 2020 GMC Sierra HD will represent a complete overhaul of the heavy duty Sierra 2500HD and 3500HD models. The models are expected to go on sale some time in the 2019 calendar year as a 2020 model and deliver improvements in all areas, including design, capability, fuel economy, and comfort.