• 2011 GMC Sierra All Terrain HD Concept

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While the Detroit Auto Show is just a few weeks away, General Motors has decided to offer us a few hints on what the company will be offering, and the first details revealed are on the GMC Sierra All Terrain HD Concept.

Based on the Sierra HD, the Sierra All Terrain HD concept is shorter, wider, and taller than the original. It features a unique five-foot, eight-inch Crew Cab/short box body configuration that supports a wheels-at-the-corners proportion. Its exterior design is accentuated by a large, airflow-optimized grille, streamlined bumpers, large fender flares, LED lights, smooth-appearance front marker lamps integrated behind the top edge of the windshield glass, and 20-inch aluminum wheels wrapped in 35-inch-tall BFGoodrich tires.

Under the hood GMC has placed a 6.6L Duramax turbo-diesel V-8 engine that delivers a total of 397 HP and 765 lb.-ft. of torque. The engine is mated to an Allison 1000 six-speed automatic transmission.

UPDATE 01/06/2011: News images for the 2011 GMC Sierra All Terrain HD concept have been revealed. These images feature more shots of the exterior and even a couple highlighting the interior of GM’s modified heavy duty truck. Check them out in the gallery provided!

Press release after the jump.

Press release

The GMC Sierra All Terrain HD concept is an exploration of heavy-duty truck capability combined with greater off-road versatility. It is highlighted by a bold exterior design, enhanced all-terrain suspension and premium details expected of a GMC – all designed to enable greater access to off-road destinations.

The new 2011 Sierra HD underpins the All Terrain HD concept, with a modified, production-based 4WD chassis and the Duramax diesel/Allison 1000 six-speed powertrain. The enhanced suspension and unique body dimensions, including increased ground clearance and wider track, as well as greater approach/departure angles, deliver off-road capability while maintaining HD levels of payload and trailering capacity.

2011 GMC Sierra All Terrain HD Concept High Resolution Exterior
- image 386777

“The Sierra All Terrain HD concept takes GMC’s outstanding new HD platform to the next level, marries it to the legendary Duramax diesel/Allison transmission, and provides a heavy-duty expression of GMC’s premium All Terrain package,” said Lisa Hutchinson, GMC product marketing director. “It delivers the exceptional capabilities of the Sierra HD – hauling, towing and performance – and applies them to the toughest driving environments. It’s the ultimate professional-grade tool for construction crews, ranchers and adventurers whose activities aren’t limited by where the pavement ends.”

The 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.
2011 GMC Sierra All Terrain HD Concept High Resolution Exterior
- image 386784

“The capability-enhancing attributes of the Sierra All Terrain HD build on the already outstanding capabilities offered in the all-new production Sierra HD trucks,” said Hutchinson. “Although it is strictly a concept, it is a pretty realistic one.”

Purposeful design

From every angle, the All Terrain HD looks the part of a dedicated off-road performer, with bold, accentuated features complemented by a wide stance and tall profile.

Streamlined bumpers are designed to enhance approach/departure angles and incorporate frame-mounted recovery hooks – with integrated skid plates. A large, airflow-optimized grille maximizes cooling in tough conditions, while a forced-induction hood delivers more air to the Duramax diesel engine.

“The design of the All Terrain HD is an expression of its capabilities – strong, functional and absolutely professional grade,” said Carl Zipfel, design manager. “We’re excited about the design elements and exploring how they could apply to future GMCs.”

Large fender flares stretch away from the body to cover 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.

2011 GMC Sierra All Terrain HD Concept High Resolution Exterior
- image 386781

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 All Terrain HD is painted Iridium Metallic – a dark charcoal color that reveals a reddish, anodized inflection when viewed from certain angles. It complements other anodized and satin-metal finishes on the exterior, which give the truck a more precise and functional appearance.

The interior matches the exterior aesthetic, with premium appointments and increased functionality, including enhanced lighting. It conveys solidity and precision, blending accent details such as stainless steel mesh and satin chrome with an amplified expression of the All Terrain’s premium features. Two-tone dark gray leather seats, matched with embossed carbon fiber-style leather on the seating surfaces, have red contrast stitching. Additional leather-wrapped interior features include the steering wheel, instrument panel and center console.

A new navigation radio is also featured on the Sierra All Terrain HD concept and previews future radios to be offered in GMC vehicles. An integrated 80-gig hard drive contains map data for the navigation system. It eliminates the need for a map disc and provides greater storage of music from portable devices. It also features DVR-style “time lapse playback,” which allows up to 20 minutes of recording/playback from the AM/FM/XM radio stations.

All Terrain chassis and suspension

2011 GMC Sierra All Terrain HD Concept High Resolution Exterior
- image 386775

Based on the chassis of the 2011 Sierra HD trucks, the All Terrain HD features a fully boxed steel frame with exceptional strength and torsional stiffness. It incorporates the production models’ new independent front suspension and asymmetrical rear leaf-spring suspensions, but with a wider 73-inch (1,853 mm) track (front and rear) that enhances stability during off-road and highway driving. A production Sierra 2500HD has front and rear tracks of 68.8 inches (1,748 mm) and 67.3 inches (1,709 mm), respectively.

An increased ride height provides greater ground clearance of 21.1 inches (536 mm) at the rockers and 11.8 inches (300 mm) at the skid plates, while specialized Fox off-road shocks deliver exceptional damping on tough terrain. They were created specially for the All Terrain HD, with specific valving. The shocks feature visible, remote fluid reservoirs – connected to the shock bodies via custom hoses – mounted in the wheel house liners and are matched with front and rear jounce shocks. They add additional compression damping and more controlled rebound, which helps increase control, stability and handling.

The All Terrain HD also features electronic disconnection of the front stabilizer bar, which enables greater crawling capability on rocky terrain. The driver simply pushes a button inside the cab to disconnect it from the front suspension.

Custom upper and lower control arms for the front suspension are designed to work with the Fox off-road shocks and jounce shocks, while supporting the greater ground clearance and ride height. They contribute to the wider track, as do the aggressive 20-inch machined aluminum all-terrain wheels. The wheels are deep, with six split-spoke elements, and are constructed in a reverse drop-flange method that ensures optimal strength. They also feature a mix of satin chrome and anodized aluminum finishes, which provide durability and a premium appearance that complements the body’s Iridium Metallic color.

A full composite underbody protection system shields the All Terrain HD’s transmission, drivetrain, fuel tank, exhaust system and axle differentials. It starts with the front bumper, which rolls beneath the truck and leads to a composite, integral belly pan that covers a front suspension skid plate. Protective covers are also mounted beneath the driveline components, while the front and rear differentials feature direct-mounted skid plates. The rear bumper is integrated with the rear skid plate.

Powertrain details

2011 GMC Sierra All Terrain HD Concept High Resolution Exterior
- image 386784

The Sierra All Terrain HD concept is propelled by the new, production 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 powerful 6.6L Duramax is more fuel-efficient – with up to 11-percent greater fuel economy than previous versions – and reduces NOx emissions by up to 63 percent. The powertrain’s efficiency is assisted by the Allison 1000 transmission, which requires less engine power to funnel torque to the axles. It also incorporates a “smart” exhaust brake feature that helps save wear on the brakes on downhill grades, a feature available on production Sierra HDs.

With the same proven powertrain as production Sierra HD trucks, the All Terrain HD delivers comparable hauling and towing capabilities, including:

  • Estimated payload capacity of 2,700 pounds (1,225 kg)
  •  Estimated conventional towing capacity of 13,000 pounds (5,896 kg)
  • Estimated fifth-wheel towing capacity of 15,600 pounds (7,076 kg).

The 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.

Alina Moore
Alina Moore
Alina Joined the Topspeed.com team in the early 2000s as one of the outlets very first experts, and she’s been with Topspeed.com ever since. Over the years, she’s served various roles, but today she’s is relied on heavily to verify automotive facts, assist with formatting, and discover new and engaging topics.  Read full bio
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Show Comments


  (291) posted on 08.28.2012

Millions of dollars await them if ever they launched this awesome car. If I were them, I would make the release date earlier.

  (1332) posted on 08.28.2012

Wow! They could bring lots of money to them if they will release this truck to the market. Monster car lovers would surely love it.

  (676) posted on 01.31.2012

This All-terrain is greatly planned the concept. The bumper is wide and perfect for off-road and the exterior are strong enough to withstand greater magnitude of impact.

  (517) posted on 01.17.2012

this car is nice. this car are like a pajero type of car. i like the look of this car and also the face. and all the part of this car. if you will see the top view the front view the side view. all is good when you see it when it comes to engine the engine of this car is very good and tested.

  (776) posted on 12.21.2011

The Sierra’s current grill has a flat upper-lip, and by switching the Grill up-side down is what gives it this look. It’s a good thing as well that it has an awesome engine specs.

  (434) posted on 11.10.2011

This truck is absolutely looks so massive on its platform and most especially on its wheels, and I’m glad that it had an impressive engine specification which for sure, could really give a nice speed performance on it.

  (452) posted on 10.19.2011

I don’t think that the engine that it had can give a better performance of this Sierra, too bad that it didn’t fit on its impressive exterior appearance and interior features.

  (484) posted on 10.12.2011

I love the muscular appearance of this concept, well. I will surely wait for the market production of this one, but I noticed that it doesn’t really look great on its body paint, and I’m quite wondering on its interior features.

  (474) posted on 10.2.2011

Sierra concept is one of the outstanding new HD platform, its capabilities and performance really shows of an exceptional driving environments. Taking on its design this off-road vehicle really complemented on its wide stance and strong tall profile. Very masculine and attractive too.

  (692) posted on 09.12.2011

What a powerful pick truck GMC has. A classy yet strength design and advance electronic disconnection, more preferably from the rocky roads- its the best wider track.

  (466) posted on 09.2.2011

I can’t see any difference on this concept pick up car but I’m still impressed with this. It seems that it can bear all heavy things that you want to bring along.

  (320) posted on 05.11.2011

GMC Sierra is a kind of truck appearance that gives its full package, That carries a heavy duty baggage that was enable to put things in a safe place.

  (398) posted on 05.5.2011

One thing i admired with this GMC sierra Concept is the streamlined bumpers that connected along edge of the back bumper of the model car,The design offer functionality and maximizing the grille in cooling with tough conditions.

  (40) posted on 05.4.2011

The EcoBoost engines are from Ford. You know that right? GM is trying to copy Ford once again, with this to go after the Raptor, and then trying to make Cameros as fast as Mustangs. Such a shame.

  (386) posted on 03.10.2011

I was actually lucky enough to see this during the event. Quite interesting really, since you get to see the EcoBoost engines most important parts.

  (599) posted on 02.9.2011

The high-intensity LED park and turn signal lamps turns to be a better performance of the car itself.

  (466) posted on 01.25.2011

The powerful 6.6L Duramax is more fuel-efficient – with up to 11-percent greater fuel economy than previous versions – and reduces NOx emissions by up to 63 percent.

  (346) posted on 01.10.2011

Perhaps it’s just my eye, but the geometry of the profiles is near identical. Don’t get me wrong, I love the look of the big Fords, but I’d kind of like GM to go their own direction... for the sake of diversity.

  (320) posted on 01.10.2011

I hope they don’t make this exactly like the render. Every HD truck GM has been pumping out for the last few body styles have been directly copies of F-250’s and Super Duties.

  (444) posted on 01.9.2011

Which is why Ford is being even lazier by recently hiring Cadillac’s Max Wolf to resurrect their sorry sack Lincoln brand. But I say, sloppy seconds just aren’t gonna do.

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