The 2020 GMC Sierra Heavy Duty has been redesigned from the ground up to combine even greater capability for towing trailers with style, and has been packed with the latest technology available on heavy-duty pickup trucks in general.
An even bolder exterior design is emphasized by the new signature lighting, which includes prominent so-called “light blades,” consisting of LED daylight driving lights. LED technology is used almost everywhere on the car, including for the new headlamps, taillights, optionally available fog lamps and other elements, such as the available roof marker lights.

The interior has been redesigned as well, now offering best-in-segment head- and leg room for the Crew Cab version. The driver benefits from an even higher driving position, while the optionally available head-up display is a first for its segment.

Towing fans will rejoice at the news that the model can now be had with a segment-first Allison 10-speed automatic transmission paired with the tried-and-true 6.6L Duramax turbo diesel. With 445 horsepower and a massive 910 lb-ft of torque at its disposal, the legendary Duramax engine now has increased cooling capacity mostly thanks to the introduction of a dual-path intake system that uses the prominent hood scoop to cool air. As before, dual rear wheels and single rear wheels configurations are available.

Designed to deliver class-leading capability with enhanced comfort and smarter technologies, the new 2015 GMC Sierra HD lineup advances a 111-year legacy of professional heavy-duty trucks.
The new Sierra HDs arrive in the first quarter of 2014, including 2500HD and 3500HD models, and the Sierra Denali HD, which matches do-it-all capability with an exclusive package of design and upscale interior amenities. Sierra HD trucks have a new face that conveys GMC’s professional grade aesthetic with greater technical precision, including an all-new headlamp and grille design, power-dome hood - with specific badging on Duramax-equipped models - and a one-piece chrome bumper (body-color bumper on Denali). The 2015 Sierra HD lineup benefits from interior introduced on the 2014 Sierra 1500. Premium materials, greater attention to detail and purposeful technologies define the passenger space, with soft-touch materials and available aluminum trim providing premium accents to an interior designed to be a productive, easy-to-use environment.

Designed to deliver class-leading capability with enhanced comfort and smarter technologies, the new 2015 GMC Sierra HD lineup advances a 111-year legacy of professional heavy-duty trucks.
The new Sierra HDs arrive in the first quarter of 2014, including 2500HD and 3500HD models, and the Sierra Denali HD, which matches do-it-all capability with an exclusive package of design and upscale interior amenities. Sierra HD trucks have a new face that conveys GMC’s professional grade aesthetic with greater technical precision, including an all-new headlamp and grille design, power-dome hood - with specific badging on Duramax-equipped models - and a one-piece chrome bumper (body-color bumper on Denali). The 2015 Sierra HD lineup benefits from interior introduced on the 2014 Sierra 1500. Premium materials, greater attention to detail and purposeful technologies define the passenger space, with soft-touch materials and available aluminum trim providing premium accents to an interior designed to be a productive, easy-to-use environment.

The third generation of the Sierra pickup 2500 HP showed up in 2007 as a 2008 model, and GMC built it in three cab versions.
With an increasing demand for full-size pickups and room for all family onboard, General Motors offered the Sierra with a four-door cab version named Crew Cab. Sure, it might be used as a workhorse for a crew during the week, but in the weekends, it was an excellent family companion pulling that full-size trailer behind without tearing a sweat. For the 2500 HD (heavy-duty), the American carmaker used a new platform, the T900, which replaced the T800 and offered better solutions and more powerful engines than its predecessor.

Like its predecessor, the Sierra was available in a few body versions, starting with a chassis-cab and going up to the big crew-cab version. Its raked windshield at 57 degrees decreased the wind noise and the aerodynamic resistance, increasing the fuel efficiency. To add a more dynamic appearance, the Sierra featured flared wheel-arches. The Crew Cab offered an easy ingress and egress from the car thanks to its full-size rear doors.

Inside, the dashboard looked closer to an SUV than to a work truck, but its rounded instrument cluster covered a panel with more dials than a regular car. On the tall center stack, the carmaker installed a couple of cup-holders and a large storage compartment. In the back, the flat bench offered room for three with enough leg- and headroom for adults, not just for kids.

GMC offered the Sierra with a choice of two engines paired as standard to a 4-speed automatic gearbox. Unlike the rest of the 2500 HD range, the carmaker offered the Crew-Cab version with a hybrid power as well.

General Motors released the third generation of the Sierra pickup 2500 HD series in 2007 as a 2008 model year and offered it with a choice of three cabins.
It was already common to see the large, heavy-duty pickups used for weekends in the mountains or pulling trailers with boats or motorhomes on the highway. Most of them were crew-cabs, with four doors and a full house inside. The single-cab mainly was a work truck, while the Extended Cab was somewhere in between. It was still good to carry a family to the mountains, as long as it was a family with small children on board. For the 2500 HD (heavy-duty), the American carmaker used a new platform, the T900, which replaced the T800 and offered better solutions and more powerful engines than its predecessor.

Like its predecessor, the Sierra was available in a few body versions, starting with a chassis-cab and going up to the big crew-cab version. Its raked windshield at 57 degrees decreased the wind noise and the aerodynamic resistance, increasing the fuel efficiency. To add a more dynamic appearance, the Sierra featured flared wheel-arches. The Extended Cab version featured two doors for the front passengers and another pair of rear-hinged doors behind them.

Inside, the GMC Sierra offered two or three seating positions, depending on the trim level and options. Like most of the pickups on the market, it provided a big dashboard with a steering-column mounted gear-selector for the automatic transmission. The rear seats were surprisingly good as long as the occupants were not very tall.

GMC offered the Sierra with a choice of two engines paired as standard to a 4-speed automatic gearbox. It was available either as a 2WD or 4WD.

GMC released the third generation of the Sierra pickup-truck range in 2006 as a 2007 model-year for the 1500 series and the 2500 HD series in the following year as a 2008 model.
GMC had over a century of experience on the market. It couldn’t outsell the Ford F-Series, but it was close and offered an excellent platform able to pull more than the 1500 series. For the 2500 HD (heavy-duty), the American carmaker used a new platform, the T900, which replaced the T800 and offered better solutions and more powerful engines than its predecessor.

Like its predecessor, the Sierra was available in a few body versions, starting with a chassis-cab and going up to the big crew-cab version. Its raked windshield at 57 degrees decreased the wind noise and the aerodynamic resistance, increasing the fuel-efficiency. To add a more dynamic appearance, the Sierra featured flared wheel-arches. The Regular Cab version featured a two-door cabin with either a bench or a pair of seats. The bed in the back was available in three sizes of 5.75’ (1752 mm), 6.5’ (1981 mm), and 8’ (2438 mm) on three different wheelbases.

Inside, the GMC Sierra offered two or three seating positions, depending on the trim level and options. Like most of the pickup-trucks on the market, it provided a big dashboard, with a steering-column mounted gear-selector for the automatic transmission.

The manufacturer offered the Sierra with a choice of two engines paired as standard to a 4-speed automatic gearbox. It was available either as a 2WD or 4WD.