2026 GMC Sierra 2500 HD AT4 Pickup

The right hand drive 2026 GMC Sierra 2500 HD AT4 from Autogroup International brings heavy-duty strength, off-road confidence, and refined comfort to Australian roads. Starting with a Crew Cab in Onyx Black with a Jet Black with Kalahari interior, and powered by the Duramax 6.6-litre Turbo Diesel V8 paired to an Allison 10-speed automatic transmission, each build undergoes a mirror-image right-hand-drive conversion to full ADR compliance in our ISO 9001-certified facility. Every vehicle is supported in Australia with a 5-year unlimited-kilometre warranty, a 40,000 km spare parts kit, and 24/7 roadside assistance.

The AT4 brings premium off-road hardware and engineering to the Sierra 2500 HD platform. Key features include off-road tuned suspension with Rancho monotube shocks, skid plates for underbody protection, and 20-inch machined aluminium wheels with Goodyear Wrangler Duratrac all-terrain tyres. A two-speed Autotrac transfer case, automatic locking rear differential, and Hill Descent Control provide confidence and stability across rugged terrain. Practical features like the spray-on bedliner, GMC MultiPro tailgate, power-extend and heated trailer mirrors, LED fog lamps, cargo lighting, and rear wheelhouse liners add everyday usability to serious off-road capability.

Inside, the Sierra 2500 HD AT4 combines toughness with premium technology. A 13.4-inch GMC infotainment system with Google built-in, wireless Apple CarPlay® and Android Auto™, and a 12.3-inch driver information display keep you seamlessly connected. Comfort features include dual-zone automatic climate control, heated and ventilated front bucket seats, heated rear outboard seats, and a 60/40 split-folding rear bench for flexible cargo space.

Advanced safety and driver assistance technologies include Forward Collision Alert, Lane Departure Warning, Front Pedestrian Braking, IntelliBeam automatic high beams, Trailer Sway Control, and an Integrated Trailer Brake Controller with dedicated Trailering App.

For Australian buyers seeking a true heavy-duty pickup that balances luxury, control, and real off-road capability, the 2026 GMC Sierra 2500 HD AT4 Diesel stands as the benchmark – engineered, converted, and supported by Autogroup International.