All Terrain HD
litre V8 Duramax diesel
The GMC Sierra All Terrain HD concept is a heavy-duty,
off-road pickup which was created by GMC's design team
as a way of showing off the potential of the new-for-2011
With a modified, production-based 4WD chassis and the
Duramax diesel/Allison 1000 six-speed powertrain, the
GMC Sierra All Terrain HD features enhanced suspension,
a higher ground clearance and a wider track. The GMC Sierra
All Terrain HD also displays improved approach/departure
angles (thanks to a shorter overall length) and superior
off-road capability - while all the time maintaining the
same cargo and trailer pulling characteristics of the
2011 Sierra HD.
Lisa Hutchinson, GMC product marketing director said of
the Sierra All Terrain HD concept: "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." She continues. "Although it is
strictly a concept, it is a pretty realistic one."
The designers took care to make sure that the styling
of the GMC Sierra All Terrain HD wasn't filled with superfluous
plastic bits that would hinder the vehicle's off-road
potential. Instead they focused on making the front and
rear bumpers more streamlined and neat - helping improve
the approach and departure angles even further. The bumpers
also house frame-mounted recovery hooks - just in case
- and integrated skid plates to protect the vehicle's
underside. A large, airflow-optimized grille maximizes
cooling in tough conditions, while a forced-induction
hood feeds more air to the Duramax diesel engine.
Carl Zipfel, the design manager for the GMC Sierra All
Terrain HD concept said of the vehicle's styling: "The
design of the All Terrain HD is an expression of its capabilities
strong, functional and absolutely professional
grade. We're excited about the design elements and exploring
how they could apply to future GMCs."
The GMC Sierra All Terrain HD Concept features large fender
flares which help cover the 35-inch-tall BFGoodrich tires.
At the rear, the cargo box features lockable, lighted
storage compartments, along with two special compartments
inside the cargo box which provide access to a 110-volt
power outlet and air compressor. A tough bed liner, with
a unique pattern designed to mimic the appearance of circuit
boards, provides a protective cover for the bed.
The GMC Sierra All Terrain HD Concept also features motorized
steps for the cab and cargo bed making it easier to enter
and exit the vehicle, while maximizing ground clearance
during off-road driving.
The interior of the GMC Sierra All Terrain HD concept
is designed to complement the exterior design. That means
premium appointments and increased functionality, including
enhanced lighting. 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. Trim elements are finished in
either stainless steel mesh or satin chrome.
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
Based on the chassis of the 2011 Sierra HD trucks, the
All Terrain HD concept features a fully boxed steel frame.
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.
Specialized Fox off-road shocks 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.
The Sierra All Terrain HD concept 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.
A full composite underbody protection system shields the
Sierra 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.
The Sierra All Terrain HD concept is powered by a 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 engine develops 397
horsepower and 765 lb.-ft. of torque (1,037 Nm).
The 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 further helped by the transmission, which requires
less engine power to funnel torque to the axles.
The Sierra All Terrain HD also features four-wheel drive,
with automatic locking front and rear differentials.
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