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The redesigned, next-generation Sierra HD's exterior is more visually distinguished from the Sierra 1500. Aside from its roof, which is shared with the light-duty Sierra, all other visible elements are unique to the work-focused HD truck. The standard engine is a 401-hp, 6.6-liter V8 with a six-speed transmission. A 445-hp, 6.6-liter turbodiesel V8 engine with a 10-speed transmission is also available. The new truck is 10 inches longer than the previous one, which translates to more legroom. GM claims that the new HD, when properly equipped, can tow up to 35,500 pounds. Available safety features include forward collision warning, automatic emergency braking, lane departure warning, blind spot warning, and rear cross traffic warning.
The HD Sierra and its twin the Chevrolet Silverado HD are designed for heavy towing and hauling. The 6.0-liter V8 and 6.6-liter turbodiesel, both mated to a six-speed automatic, carried over on the 2015 redesign. There is also a natural gas (CNG) version of the 6.0-liter V8. GM said that the new cabs and interiors provide increased space and comfort, with extensive storage space. The Sierra 3500HD is available with head-curtain and seat-mounted side airbags. Braking and handling capabilities on the outgoing HD Sierra come close to those of the Sierra 1500. Handling is not agile but has a modicum of responsiveness that other three-quarter-ton trucks don't provide, but it rides more stiffly than the Sierra 1500. Beginning with the 2016 model year, Apple CarPlay and Android Auto capabilities are added to the infotainment system.
These trucks are much stiffer and ride less comfortably than the standard Sierra 1500 (1/2 ton). They are designed for hard work and a 3/4 ton capacity. The ride is bouncy but the available engines include a relatively refined, Isuzu-developed 6.6-liter turbodiesel V8 and a huge 8.1-liter, 340-hp V8. There is a 6.0-liter V8 in addition to the 6.6-liter V8 turbodiesel. The six-speed Allison transmission is very smooth.
These trucks are much stiffer and ride less comfortably than the standard Sierra 1500 (1/2 ton). They are designed for hard work and a 3/4 ton capacity. The ride is bouncy but the available engines include a relatively refined, Isuzu-developed 6.6-liter turbodiesel V8 and a huge 8.1-liter, 340-hp V8. The 2007 redesign brought a new 6.0-liter V8 in addition to the older 6.6-liter V8 turbodiesel. The six-speed Allison transmission is very smooth.
