GMC Sierra All Terrain HD

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.

GM marketing chief Ewanick: “We’ll focus on Cruze all year long”

Joel Ewanik was recently named General Motors’ global marketing chief, so we sat down with him and Buick marketing honcho Roger McCormack at the Detroit Auto Show to find out how they plan to get more attention for GM’s brands.

• For both men, the priority is to get people in seats since GM appears to realize that it can’t just rely on people to trust its marketing. “We’re making great cars – the Cruze was the first car in its segment to get five stars under the new NHTSA standards,” Ewanick said, “we need to get people in sitting in the cars.” For Buick, McCormack said as well that his brand will focus on “Activities to get people in cars, sitting in cars, experiencing cars.”

• On the subject of settling Cadillac’s advertising, Ewanick said, “With Cadillac we’re trying to create some dissonance, putting them in ski resorts to remind people that Cadillac is a great brand for their snow activities with the all-wheel-drive sports wagon and CTS, SRX and Escalade.” To that end, the brand has done deals with the Northstar ski resort in Lake Tahoe and they’re doing one with Vail, in Colorado.

GM marketing chief Ewanick: “We’ll focus on Cruze all year long”

Joel Ewanik was recently named General Motors’ global marketing chief, so we sat down with him and Buick marketing honcho Roger McCormack at the Detroit Auto Show to find out how they plan to get more attention for GM’s brands.

• For both men, the priority is to get people in seats since GM appears to realize that it can’t just rely on people to trust its marketing. “We’re making great cars – the Cruze was the first car in its segment to get five stars under the new NHTSA standards,” Ewanick said, “we need to get people in sitting in the cars.” For Buick, McCormack said as well that his brand will focus on “Activities to get people in cars, sitting in cars, experiencing cars.”

• On the subject of settling Cadillac’s advertising, Ewanick said, “With Cadillac we’re trying to create some dissonance, putting them in ski resorts to remind people that Cadillac is a great brand for their snow activities with the all-wheel-drive sports wagon and CTS, SRX and Escalade.” To that end, the brand has done deals with the Northstar ski resort in Lake Tahoe and they’re doing one with Vail, in Colorado.

GMC Sierra All Terrain HD Concept is ready to play dirty

Cars are cool, but we certainly love ourselves some big, bad, hardcore pickups – you know, like the Ford F-150 SVT Raptor. General Motors’ conceptual answer to Ford’s desert-blasting pickup is this, the Sierra All Terrain HD concept, which we’ll be seeing for the first time at the Detroit Auto Show next week.

GMC’s brutish pickup relies on The General’s 6.6-liter Duramax diesel V8 for power – 397 horsepower and 765 pound-feet of torque, to be exact – and higher ground clearance, a wider stance and serious suspension upgrades make the All Terrain concept capable of storming through, well, all types of terrain.

Word on the street is that if GM gets up the gall to produce such a truck, it will likely be outfitted by a second-tier firm outside of the GM production lines (like a Roush F-150, for example). Regardless, we want this thing to be built, and badly. See a whole slate of new high-res photos for yourself in the gallery below. Oh, and don’t forget about the Ram Runner, Chrysler’s foray into the niche.

GMC Sierra All Terrain HD Concept is ready to play dirty

Cars are cool, but we certainly love ourselves some big, bad, hardcore pickups – you know, like the Ford F-150 SVT Raptor. General Motors’ conceptual answer to Ford’s desert-blasting pickup is this, the Sierra All Terrain HD concept, which we’ll be seeing for the first time at the Detroit Auto Show next week.

GMC’s brutish pickup relies on The General’s 6.6-liter Duramax diesel V8 for power – 397 horsepower and 765 pound-feet of torque, to be exact – and higher ground clearance, a wider stance and serious suspension upgrades make the All Terrain concept capable of storming through, well, all types of terrain.

Word on the street is that if GM gets up the gall to produce such a truck, it will likely be outfitted by a second-tier firm outside of the GM production lines (like a Roush F-150, for example). Regardless, we want this thing to be built, and badly. See a whole slate of new high-res photos for yourself in the gallery below. Oh, and don’t forget about the Ram Runner, Chrysler’s foray into the niche.

GM recalls select 2011 model year pickup and SUV models over axle fears

General Motors is recalling a handful light-duty GMT900 pickups from the 2011 model year due to faulty rear axle cross pins. Both the Chevrolet Avalanche and Silverado 1500 are effected, as are the Cadillac Escalade EXT and GMC Sierra 1500 – a total of 1,262 vehicles in all.

The National Highway Traffic Safety Administration cites that these rear axle cross pins were not manufactured up to proper specification and that the pin could “fracture and become displaced within the rear axle.” NHTSA further details the consequences of a displaced pin, saying:

“The driver may hear a banging noise coming from the axle. If the pin shifts out of position, it could create an interference condition and cause the rear axle to lock. The driver may not be able to maintain directional control of the vehicle and a crash could occur without prior warning.”

GM will begin notifying owners about this problem in January, and dealers will install a new rear axle cross pin without any cost to the customer. NHTSA’s official statement is available after the jump

GM recalls select 2011 model year pickup and SUV models over axle fears

General Motors is recalling a handful light-duty GMT900 pickups from the 2011 model year due to faulty rear axle cross pins. Both the Chevrolet Avalanche and Silverado 1500 are effected, as are the Cadillac Escalade EXT and GMC Sierra 1500 – a total of 1,262 vehicles in all.

The National Highway Traffic Safety Administration cites that these rear axle cross pins were not manufactured up to proper specification and that the pin could “fracture and become displaced within the rear axle.” NHTSA further details the consequences of a displaced pin, saying:

“The driver may hear a banging noise coming from the axle. If the pin shifts out of position, it could create an interference condition and cause the rear axle to lock. The driver may not be able to maintain directional control of the vehicle and a crash could occur without prior warning.”

GM will begin notifying owners about this problem in January, and dealers will install a new rear axle cross pin without any cost to the customer. NHTSA’s official statement is available after the jump

GMC Sierra All Terrain HD concept is ready for off-road action

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 concept, though GM tells us that if a road-ready version of this ultra-tough Sierra is produced, it will likely be crafted with the assistance of an aftermarket company. 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.

GMC Sierra All Terrain HD concept is ready for off-road action

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 concept, though GM tells us that if a road-ready version of this ultra-tough Sierra is produced, it will likely be crafted with the assistance of an aftermarket company. 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.