Here’s our very first look the all-new 2019 Sierra AT4 in the wild (on a public road), rather than in a studio. The sighting gives us our first opportunity to appreciate the new-for-2019 addition to the Sierra family in the “real world” after its debut in March.
Caught by GM Authority spy photographers while undergoing final validation testing in Metro Detroit, the model seen here is Crew Cab Short Bed box, coated in Red Quartz Tintcoat (paint code GPJ).
The 2019 GMC Sierra AT4 (equipment group code 4SB) slots above the SLT and below the Denali in the 2019 Sierra lineup. All Sierra AT4 units come standard with a two-inch factory suspension lift and off-road-tuned Rancho monotube shocks, a 5.3L V-8 L84 engine mated to GM’s updated 8-speed automatic transmission, 4WD with a two-speed transfer case and a locking rear differential. Additionally, all units of the Sierra AT4 are equipped with Terrain Management features, including Hill Descent Control and Traction Select System.
2019 Sierra AT4 – Front End
The front-end features several notable body-color elements, including grille surround, door handles and bumpers. The grille is finished in black chrome and features what GMC calls a unique “knurled texture”. The black chrome finish is also present on the fog lamp bezels and fender surround.
The 2019 Sierra AT4 features LED lighting from head to toe, including the latest iteration of GMC’s signature C-shaped LED Daytime Running Lights. Primary lighting duty is performed by high-intensity LED reflector lights, while the fog lights are also of the LED variety.
High-gloss black finish is supposed to adorn the mirror caps (which is not the case on this prototype) as well as the front skid plate, with red vertical recovery hooks rounding out the front-end appearance.
2019 Sierra AT4 – Side Profile
From the side, we can clearly see the longer wheelbase of the new Sierra on the T1 platform, which grows up to 3.9 inches over the previous-generation K2 trucks, while keeping roughly the same footprint. Also common to all T1-based Sierras is the integrated “bill-style” spoiler mounted at the rear-most part of the cabin.
The wheel wells of the new Sierra feature a new style, with the rear portion having a (roughly) 90-degree bend while the front part features a shape made up of two distinct curve points (at roughly 150 degrees each).
The 2019 Sierra AT4 comes standard with machined-face, dark-tinted 18-inch wheels (RPO Code RT5) that are unique to the AT4 trim, but this particular tester rides on optional 20-inch machined aluminum wheels with Carbon Grey Metallic accents (NZH) wrapped in all-terrain tires.
What’s more, this 2019 Sierra AT4 is powered by the optional 6.2L V8 L87 engine (which is part of the second-gen EcoTec3 engine family), as evidenced by the 6.2L badge ahead of the front outside mirror The 6.2L engine is available exclusively with the new GM 10-speed transmission.
The new Sierra AT4 replaces the shiny chrome window trim seen on other 2019 Sierra models with high-gloss black window trim. The truck also features AT4 signature emblems on the bottom end of the front doors.
2019 Sierra AT4 – Rear End
At the rear, the 2019 Sierra AT4 features the all-new and industry-first MultiPro Tailgate, which has six functional load/access features. One can tell whether or not the new Sierra is equipped with the innovative tailgate by the tell-tale cutline below the GMC logo that extends horizontally and then shoots upwards.
Like its front counterpart, the rear bumper is body-colored. It features improved CornerStep cutouts. Dual exhaust tips are standard, though the 2019 Sierra doesn’t feature a “true” dual exhaust setup, as is the case mentioned previously regarding the 2019 Silverado.
A large GMC logo is present in the middle of the tailgate, with Sierra badging immediately below. The AT4 badge is placed at the lower corner of the tailgate, on the passenger side.
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