The Sierra Denali HD comes on the 2500HD chassis, in a 4WD crew cab standard box configuration. The vehicle is equipped with a standard Vortec 6.0L gas V-8/six-speed automatic powertrain, but there is also a new Duramax 6.6L turbo diesel/Allison 1000 six-speed transmission powertrain available.
In terms of performance, 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.
"The new Sierra Denali HD is the latest expression of GMC's Denali philosophy of blending capability with premium features and styling," Lisa Hutchinson, GMC product marketing director, said in a release. "It is a premium tool that offers many comfort and infotainment features, along with a maximum towing capacity of 15,600 pounds with the segment's most powerful diesel – that's enough to tow a 34-foot-long, three-axle travel trailer."
Exterior styling features include the Denali four-bar, chrome grille with round air inlets, body-color bumpers, chrome door handles, chrome accents and 18- and 20-inch polished forged aluminum wheels.
The Sierra Denali HD, however, has also been fitted with a number of infotainment features, such as OnStar and Turn-by-Turn navigation, available mobile WiFi, USB connectivity, Bluetooth connectivity, and XM Satellite Radio.
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