TodayApril 16, 2022

GMC Sierra All-Terrain HD concept

2011 GMC concept

GMC sales are up 28 percent from last year, and Sierra is the cornerstone of the GMC brand.

What do I think of this concept?

It looks like a production vehicle to me, and if it is not GMC is crazy. The diesel All-Terrain heavy-duty is an enhanced version of the 2500 Sierra that could take on the Ford Raptor.

I just don’t like the name, all-terrain. Sounds almost civilized. Something like the GMC Hulk would be better. Hulk, like Bulk, because this truck makes the Sierra HD look gentrified.

It’s got everything on it – lockable side storage, frame-mounted recovery hooks, composite bed liner, 360 floodlights. The concept beats out Ford by offering motorized illuminated assist steps. Carl Zipfel, GMC’s Chief designer gave the concept a bigger grille, larger hood and bulky quarter panels. It’s got greater ground clearance and greater off-road capability.

GMC says the concept will have an estimated conventional towing capacity of 13,000 pounds and an estimated fifth-wheel towing capacity of 15,600 pounds. It is powered by a 6.6-liter Duramax turbo-diesel V-8 and Allison 1000 six-speed automatic transmission powertrain combination.  That is the same Duramax that is in the Sierra HD already.  The Duramax is rated at 397 horsepower and an astounding 765 foot-pounds of torque.

2011 GMC concept



Vehicle: GMC All Terrain HD concept
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 / kW @ rpm: 397 / 296 @ 3000
Torque (lb.-ft/ / Nm) @ rpm: 765 / 1037 @ 1600
Transmission: Allison 1000 six-speed automatic
Suspension (front): long- and short-arm independent with torsion bars
Suspension (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  (in / mm): front: 13.97 x 1.57 / 355 x 40

rear: 14.17 x 1.34 / 360 x 34

Wheel size and type: 20 x 9.5-inch aluminum
Tire type and size: BFGoodrich KM2 325/60R20
Wheelbase (in / mm): 148.6 / 3774
Overall length (in / mm): 230.9 / 5864
Overall width (in / mm): 83 / 2106
Overall height (in / mm): 81.8 / 2077
Track “ front (in / mm): 73 / 1853
Track “ rear (in / mm): 73 / 1853
Minimum ground clearance “ (in / mm): 21.1 / 536 (at rocker panels); 11.8 / 300 (at skid plates)
Approach angle “ front (deg.): 39
Approach angle “ rear (deg.): 31
Maximum payload (lbs. / kg): 2700 / 1225 (est.)
Maximum towing capacity “ ball hitch (lbs. kg): 13,000 / 5896 (est.)
Maximum towing capacity “ fifth-wheel hitch (lbs. kg): 15,600 / 7076 (est.)

Note: Information shown is current at time of publication.

Lou Ann Hammond

Lou Ann Hammond is the CEO of Carlist and Driving the Nation. She is the co-host of Real Wheels Washington Post carchat every Friday morning and is the Automotive, energy correspondent for The John Batchelor Show and a Contributor to Automotive Electronics magazine headquartered in Korea. Hammond is a founding member of the Women's World Car of the Year #WWCOTY, and board member of the Women in Automotive.

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