2026 GMC Sierra 1500 AT4X

At a glance: Duramax 3.0L turbo-diesel I6 · 10-speed automatic with Electronic Precision Shift · 4WD · Crew Cab, short bed · 6,500 miles · Obsidian Rush full-grain leather · 18-inch Onyx Black painted aluminum wheels

The AT4X was built for drivers who treat the trail as the destination, and the Preferred Equipment Group 4SG on this truck adds both locking differentials — driver-selectable full-locking front and full-locking rear — along with a 2-speed transfer case, off-road suspension, skid plates, hill descent control, and a heavy-duty air filter. The spray-on bedliner with GMC logo and rear wheelhouse liners are already done.

A gloss black header with dark nickel grille insert bars gives the front end the blacked-out look AT4X buyers come in for.

Inside, the comfort story is just as complete. Heated and ventilated front seats, heated second-row outboard seats, a power sunroof, a power rake and telescoping steering column, and a floor-mounted center console with wireless charging and a 120-volt interior outlet make up the cabin.

The 13.4-inch diagonal premium GMC infotainment system with Google built-in — navigation, voice assistance, color multi-touch display — runs alongside a Bose Premium Series 12-speaker system, a multicolor 15-inch diagonal head-up display, Apple CarPlay and Android Auto with wireless mirroring, and a SiriusXM with 360L trial subscription. A remote vehicle starter system, keyless open and start, push button start, and front rain-sensing wipers round out everyday convenience.

The trailering package is well-equipped: an integrated trailer brake controller, HD Surround Vision, hitch view, bed view camera, trailer camera provisions, trailer side blind zone alert, trailer tire pressure monitor system, in-vehicle trailering system app, and a MultiPro Tailgate audio system by Kicker. GMC Pro Safety covers forward collision mitigation, rear cross traffic braking, rear pedestrian detection, ultrasonic front and rear park assist, and a rear camera.

A universal home remote, perimeter lighting, LED cargo area lighting, and the engine block heater round out the equipment list.

Napleton Buick GMC is at 6305 Northwest Hwy (US-14) in Crystal Lake — on the Metra UP-NW line and a straightforward drive from Huntley, McHenry, Woodstock, and Barrington. The store has been family-owned for more than 80 years, and the process here is low-key: look at the truck, ask questions, take it out.

If the AT4X is the right build, bring the gear and see how it fits.