2026 GMC Sierra
2500 HD AT4 Pickup

2026 GMC Sierra 2500 HD AT4 pickup, right hand drive, built for drivers who want to combine heavy-duty strength with premium off-road ability and refined comfort. It suits those who need serious towing performance, rugged confidence on any surface and everyday usability in Australia and global right hand drive markets.

Under the bonnet sits a choice of two powerful engines: the 6.6-litre Duramax turbo-diesel V8 producing 470 hp (349 kW) and 975 lb-ft (1,322 Nm) of torque, or a 6.6-litre petrol V8 rated at 401 hp (299 kW) and 629 Nm. Both are paired to a 10-speed automatic transmission and full-time four-wheel drive, delivering smooth shifts, immense low-end pulling power and long-haul reliability. With this configuration, the Sierra 2500 HD AT4 provides performance and control across highway, worksite and off-road terrain.

Capability is the hallmark of the AT4. Designed as a dedicated off-road model, it features a factory-tuned suspension with off-road shocks, a two-speed transfer case, auto-locking rear differential, skid plates and an elevated ride height for superior ground clearance. Maximum towing capacity reaches approximately 9,600 kg (TBC for Australian specification), supported by integrated trailer-brake controls and tow-haul modes for safe, stable hauling. The robust high-strength steel frame ensures durability and highway composure, while off-road calibrated traction control and hill descent assist make it equally confident in the dirt.

Inside, the AT4’s cabin balances luxury with practicality. The crew cab provides generous space for five adults, finished in perforated leather with Kalahari contrast stitching unique to AT4 trim. Heated and ventilated seats, a 13.4-inch infotainment touchscreen with Google Built-In, and a 12.3-inch digital driver display deliver technology convenience and modern refinement. Driver-assist features such as adaptive cruise control, trailer blind-spot monitoring, and 360-degree surround vision ensure safety assurance and ease of use on or off the job.

Autogroup International performs the mirror-image right hand drive conversion under its ISO 9001:2015-certified process. Every control, harness and steering component is re-engineered to OEM-equivalent functionality, preserving factory quality and reliability. Systems such as trailer braking, infotainment and driver assistance are tested for seamless integration, ensuring the Sierra 2500 HD AT4 drives naturally in right hand drive configuration.

Options and personalisation allow each truck to suit its purpose. Factory and Autogroup options include upgraded off-road wheels and tyres, tonneau covers, towing enhancement kits, touring protection packs, bed lighting and interior finish upgrades. These additions strengthen both the vehicle’s capability and individual style while supporting long-term resale confidence.

Every right hand drive 2026 GMC Sierra 2500 HD AT4 is fully engineered and documented for the Australian market and comes with a factory-backed 3-year unlimited-kilometre warranty, with conditions identical to the OEM’s original warranty. Each vehicle is supported by nationwide 24/7 roadside assistance and a service-and-parts kit through Autogroup’s Melbourne service centre.

Call the International Sales Team on +94 785 739 875 or the Australian team on (03) 9765 1300, or email vehicles@autogroupinternational.com
to request a build consult, confirm colour and interior, and review delivery timelines.