We are not that into GMC’s production cars to be honest, but we love their concept cars because they always look cartoonishly good! Check out this new one they’ve made for the 2011 NAIAS. It’s called the GMC Sierra All Terrain HD Concept and it’s a mixture between a heavy duty truck and a versatile off-roader.

The car’s built on a modified, production-based 4WD chassis and the Duramax diesel/Allison 1000 six-speed powertrain but gets a unique suspension system, which in combination with the wheels and the body dimensions makes it an awesome looking vehicle capable of traveling over super rough surfaces.

The GMC Sierra All Terrain HD features a unique five-foot, eight-inch Crew Cab/short box body configuration that supports a wheels-at-the-corners proportion. Shorter in overall length than production Sierra HD models, the concept’s dimensions contribute to greater approach/departure angles. Additional off-road elements include:

• Wider, 73-inch (1,853 mm) track for greater stability
• Approximately 3 inches (76 mm) greater ground clearance
• Custom front upper and lower control arms
• Specially constructed Fox off-road shocks with remote fluid reservoirs (integrated in the wheel house liners)
• Front and rear jounce shocks
• Electronic front stabilizer bar disconnection
• 35-inch-tall BFGoodrich KM2 “mud terrain” tires mounted on 20-inch machined aluminum wheels
• Full composite underbody protection.

This Sierra comes with some great features, chief among which are the 35-inch-tall BFGoodrich tires. At the rear, the cargo box features lockable, lighted storage compartments, along with a number of tie-down cleats, including a pair in the bed floor and two on each side of the bed. A non-slip rubber pad is used on the tailgate, while two special compartments inside the cargo box provide access to a 110-volt power outlet and air compressor. A composite bed liner with a unique “circuit board” pattern provides a protective cover for the bed.

If only it had a gun rack for a Jackhammer!

Motorized, deployable assist steps for the cab and cargo bed make it easier to enter and exit the All Terrain HD, while maximizing ground clearance during off-road driving. It also incorporates a number of industrial-grade lighting elements to provide greater visibility for safer driving where stars may be the only other source of illumination. The lighting details include:

• High-intensity LED headlamp, taillamp and fog lamp lighting mounted in impact-resistant composite housings and featuring edge-lit illumination
• High-intensity LED park and turn signal lamps
• Smooth-appearance front marker lamps integrated behind the top edge of the windshield glass
• Integrated center high-mounted stop lamp and rear marker lights mounted at the top edge of the rear window glass
• LED floodlights for the cargo bed and assist steps.

The engine that powers the Sierra HD Concept is the 6.6L Duramax turbo-diesel V-8 and Allison 1000 six-speed automatic transmission powertrain combination offered in the 2011 Sierra HD trucks. The Duramax is rated at 397 horsepower (296 kW) and 765 lb.-ft. of torque (1,037 Nm).

The GMC Sierra All Terrain HD also features four-wheel drive, with automatic locking front and rear differentials, while the 14-inch, four-wheel disc brake system from the production Sierra HD provides the stopping power for this unique off-roader. It offers payload capacity of 2,700 pounds (1,225 kg), conventional towing capacity of 13,000 pounds (5,896 kg) and Estimated fifth-wheel towing capacity of 15,600 pounds (7,076 kg).

GMC SIERRA ALL TERRAIN HD CONCEPT SPECIFICATIONS

• Body style / driveline: 5-passenger crew cab, 3/4-ton 4-wheel-drive heavy-duty pickup
• Construction: body on frame
• Engine: Duramax 6.6L turbo-diesel
• Horsepower: 397 hp (296 kW) @ 3000 rpm
• Torque: 765 Nm (1037 lb.-ft) @ 1600 rpm
• Transmission: Allison 1000 six-speed automatic
• Suspension
  • front: long- and short-arm independent with torsion bars
  • rear: semi-elliptic two-stage multi-leaf spring
• Steering type: integral power-assisted recirculating ball
• Brakes (type): power-assisted, Hydroboost brake-apply system, four-wheel disc, four-wheel ABS
• Brake rotor (diameter x thickness)
  • front: 13.97″ x 1.57″ / 355 x 40 mm
  • rear: 14.17″ x 1.34″ / 360 x 34 mm
• Wheel size and type: 20 x 9.5-inch aluminum
• Tire type and size: BFGoodrich KM2 325/60R20
• Wheelbase: 148.6″ / 3774 mm
• Overall length: 230.9″ / 5864 mm
• Overall width: 83″ / 2106 mm
• Overall height: 81.8″ / 2077 mm
• Track
  • front: 73″ / 1853 mm
  • rear: 73″ / 1853 mm
• Minimum ground clearance
  • 21.1″ / 536 mm (at rocker panels)
  • 11.8″ / 300 mm (at skid plates)
• Approach angle
  • front: 39°
  • rear: 31°
• Maximum payload (est.): 2700 lbs. / 1225 kg
• Maximum towing capacity (est.)
  • ball hitch: 13,000 lbs. / 5896 kg
  • fifth-wheel hitch(est.): 15,600lbs. / 7076 kg