GMC today announces the new 2011 Sierra Denali HD, the first offering of the exclusive Denali line on a heavy-duty GMC pickup. The Sierra Denali HD leads a comprehensively redesigned lineup of 2011 Sierra 2500HD and 3500HD trucks that go on sale in early summer – including the most powerful diesel engine in the segment.
![2011 GMC Sierra All Terrain HD Concept 2](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj1Ql5CX4B_dtIju9pstyuE2isWqQ_u86KzY8RhYZ3hP1_S8HCwun0glGHxpn5HIRHxsKqCdfL9Wv4QmhBBAhSm5WOpkWv-BkDKvGJGWKBBycaMFFD1STbw3Gzrmt5sPZvaTFU268RQcYhN/s400/2011-GMC-Sierra-Denali-HD-Front-580x386.jpg)
Sierra HD’s new 6.6L Duramax turbo diesel delivers 397 horsepower (296 kW) at 3,000 rpm and 765 lb.-ft. of torque (1,037 Nm) at 1,600 rpm.
![2011 GMC Sierra All Terrain HD Concept 3](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEju13TyL5WsBlAEIk2seZsgRY0Gz0uswH_SozDgWVTZ5L24h7_cBhbGplndAO5Nuebm4jgdIK0ec_xr8-kPnpINe8RLdlQxKbT4S7D-BJq-md_3celugiJJDThvZK5TtKtJz9fUJatOzEOw/s400/2011-GMC-Sierra-Denali-HD-Front-Side-580x386.jpg)
The Sierra Denali HD comes exclusively on the 2500HD chassis, in a
4WD crew cab standard box configuration. A Vortec 6.0L gas V-8/six-speed automatic powertrain is standard and the new Duramax 6.6L turbo diesel/Allison 1000 six-speed transmission powertrain is available.
![2011 GMC Sierra All Terrain HD Concept 4](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiDhL_czsQ0CoPvS2np31Twl9RrM7muilIMrhBdeFQvpw3Eqk3-kDuOToVTjm6tVD9YEvhJMdGvvxB-GE_9IMR1ZRGVq5rpCj-xsLXnc0UY3N5Ssf8E1dPRdMERawPlz-YrcjlpPOp9366G/s400/2011-GMC-Sierra-Denali-HD-Front-View-580x386.jpg)
The iconic Denali four-bar, chrome grille with round air inlets distinguishes the Sierra Denali HD on the outside, along with body-color bumpers, chrome door handles, chrome accents and 18- and 20-inch polished forged aluminum wheels.
![2011 GMC Sierra All Terrain HD Concept 5](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgdZwie3prq48WSGh5AZlbJ7fgkbk_nfwHSCxCy4iSBdN_DouJcdf9RN8rymumTLmvGGxLth56e_9mp3j7Q32UClqiJahTJt-PxWqBndRHu_HXlDHaUWmUO41ol7UHBY2zbSr2uSVUuoc5p/s400/2011-GMC-Sierra-Denali-HD-Rear-580x386.jpg)
The balance of the new 2011 Sierra HD lineup is identified on the outside by new, three-bar grilles and powertrain-badged louvered hoods, along with a revised, full-width chrome steel front bumper and a new family of 17-, 18- and 20-inch wheels. It’s beneath the skin, however, where they are truly separated from their predecessors – and the competition.
![2011 GMC Sierra All Terrain HD Concept 6](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiUSzqf0bHeIo5dfenhmw7BZDjM2RDiA8NMrReCpNCZrm9XFYix8ZIdGDlrxgUjmlgtYgLr34EJwEUSa1Qk5OlquLoQESflnaCy2Fug1VdeJ1EemuUXVE6HdGbIy_nXqLSHdsVwgYwhIcFy/s400/2011-GMC-Sierra-Denali-HD-Rear-View-580x386.jpg)
![2011 GMC Sierra All Terrain HD Concept 7](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiMyJCZpFOFBjMXa62jUstgt791GuWkM1VGsR_xB5jZcgSZUJNkPBlMQgx3HhlU0IXVKv7z8SnW1RPygJgaZrIW46qSdYTnxNCNEUcvxYA_ZIgtNgYLgUwqau2O1Gb9ePs9_ASuRP_4b862/s400/2011-GMC-Sierra-Denali-HD-Side-580x386.jpg)