GMC Sierra 3500HD

Current Model
The next-generation Sierra HD exterior is more visually distinguished from the light-duty Sierra with the redesign. In fact, the Sierra HD shares only its roof with the light-duty.
All other visible elements are unique to the work-focused HD truck. The standard engine is a 401-hp, 6.6-liter direct-injection V8 with a six-speed transmission. The other choice is a 445-hp, 6.6-liter turbodiesel V8 engine with an Allison 10-speed transmission. The 2020 model is quite a bit bigger than the 2019 model in all dimensions, riding on a 5.2-inch longer wheelbase, measuring an extra 10.4 inches bumper to bumper. The maximum towing capacity for the diesel crew cab version is 31,400 pounds, and the maximum payload is 5,890 pounds. Available advanced safety systems include forward collision warning, automatic emergency braking, and rear cross traffic warning.
Road Test
Predicted Reliability
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2015-2019
2015 Redesign Year
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.
$25,900 - $36,500
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2011-2014
2011 Redesign Year
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.
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2007-2010
2007 Redesign Year
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.
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2003-2006
2003 Redesign Year
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.
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