• Dec 16, 2010
GMC Sierra All Terrain HD concept – Click above for high-res image gallery

If you think the Ford F-150 SVT Raptor is too hot yet the Dodge Ram Power Wagon is too cold, General Motors' latest concept might strike you as "just right." This, the GMC Sierra All Terrain HD concept, looks to bridge the gap between the two hardcore pickups from GM's crosstown rivals, while still offering top-notch levels of power, refinement and technology.

The four-door 2011 Sierra HD underpins the All Terrain concept, and power comes from The General's 6.6-liter Duramax diesel V8. A six-speed automatic sends the 397 horsepower and 765 pound-feet of torque to all four wheels. Versus a normal Sierra HD, ground clearance has been increased by about three inches, width has been bumped up to 73 inches (four more than normal) and the whole package rides on 20-inch aluminum wheels wrapped in 35-inch BFGoodrich KM2 mud terrain tires. Off-road performance is enhanced with the addition of Fox off-road shocks (just like the Ford Raptor).

Inside, GM has fitted the All Terrain concept with a Denali-spec interior with additional satin metal finishes and a leather-wrapped dash. What's more, a next-generation stereo system with an 80-gigabyte hard drive has been fitted inside this concept, and we'll soon be seeing this new system across the full GM product range.

Currently, there are no plans to create a production version of the All Terrain HD concept, though word is that if a road-ready version of this ultra-tough Sierra is produced, it probably wouldn't come off of a GM line – it would likely be crafted with the assistance of a second-tier firm (think: Roush). We'll be seeing the All Terrain concept in person at the Detroit Auto Show in just a few weeks, but for now, click through our high-res image gallery below, or follow the jump for the official release.

[Source: General Motors]

Show full PR text
GMC Sierra All Terrain HD Concept Takes Heavy-Duty Capability To New Ground

DETROIT – 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.

"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.

"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.

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

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

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.

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    • 1 Second Ago
      • 4 Years Ago
      How I dearly miss the Terradyne concept. So much better looking and original. Seems like all trucks are trying to copy eachother as of late. How about something more original.
      • 4 Years Ago
      Is that a RamBox knock off?
        • 4 Years Ago
        Dude I thought the same thing but then I thought about it, where did Dodge get the idea for the Rambox? Well I'm a thinking it was there own design aka the 2002 Avalanche...I'm not hating on Ram (or u), I let my Hemi sing everyday!
      • 4 Years Ago
      Even though I've had my fair share of trucks, and some big muthas, too, I am not a big fan.

      • 4 Years Ago
      Wow, a lot more hate for this than I expected. Who doesn't like big, offroad-capable trucks with a kajillion lb-ft of torque? Ok, maybe 700+ isn't quite a kajillion, but you get the idea. And just look at it! Doesn't it it just SCREAM "Drive me wherever you want!"?

      The only thing I don't like about this idea is the "Denali-spec interior". Maybe I'm weird, but that just doesn't fit in my mind. When I think off road, I imagine mud, rocks, sand, etc., and to track that crap onto a super nice interior just doesn't seem...right. I'd much rather have a durable, cleanable, less-luxurious cabin in a vehicle like this. Like I said, maybe I'm weird, but those are my thoughts.
      • 4 Years Ago
      An 80Gb hard drive in it? I hope it's an SSD, because with any off-roading it'll either get some serious head slaps, or the shock sensor will keep the heads parked so much that it will be non-functional.

      I think it would be better as a 1/2 ton, instead of an HD.
      • 4 Years Ago
      I have the Raptor and love this as well. Production off road vehicles. Yeah baby!
      • 4 Years Ago
      I forgot.............WOW it's got the same shocks as the raptor, big frickin deal. Ford used GM Detroit Diesel ENGINES in some of their own f650 and larger trucks built throughout the 1990's, your point is ???????
      • 4 Years Ago
      NUTCRACKER............ never.. ever... send a Turdyota to do a SIERRA"S job...................
      • 4 Years Ago
      Nice looking grille outer ring from FORD.
        • 4 Years Ago
        Holy Raptoff batman i mean Ripoff, sorry...

        Forward thinking makes money GM, not backward.

        • 4 Years Ago
        The grill is sized about the same as Ford's Super Duty's, but looks much more attractive here. Frankly, I think Ford's current grill is very unattractive, but this one somehow makes those proportions work.
        • 4 Years Ago
        Exactly!!! My first impression was they stole the frontend off the Ford SD and just added a cheezy grill insert.... Then again, copy is the best form of flattery...!!! GM cant be original, just copy the segment leading Ford SD... pretty lazy..!!!
        • 4 Years Ago
        the upper silhouette of the grill and it's relationship/proportion to the hood and headlamps is very Ford, and reminds me of earlier variations of the Super Duty grill/hood. The Sierra's current grill has a flat upper-lip, and by switching the Grill up-side down is what gives it this look.

        Its a very attractive pickup. It probably does what the Ram power-wagon can really well, and maybe run with the Raptor, which is a very happy-medium that most people will enjoy. I wonder if it lost any weight though...
      • 4 Years Ago
      what a nice looking truck? I bet the price will shock everyone.
      • 4 Years Ago
      Greg Aryous:
      "Then again, copy is the best form of flattery...!!! GM cant be original, just copy the segment leading Ford SD... pretty lazy..!!!"

      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.

      But it's flattering though, isn't it?

      • 4 Years Ago
      Gas is still too cheap...
        • 4 Years Ago
        Well, you'll be happy to know that this vehicle doesn't use any gasoline.
        • 4 Years Ago
        I know I shouldn't feed the trolls on here but....

        This isn't Playboy, so it might help to actually read the articles instead of just looking at the images and making assumptions.

        If you think gas is too cheap, pay more and explain to them why you are doing it!! I am sure they would be more than willing to take your money!!
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