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.
Segment-leading capabilities across the range include the highest payload - 7,374 pounds - and the highest conventional trailering rating - 19,600 pounds. The maximum fifth-wheel trailering rating is 23,200 pounds. Gas and Duramax diesel powertrains are offered, including a bi-fuel option that pairs the gas engine with a compressed natural gas system. Bold styling and an all-new, more comfortable and technology-infused interior are carried forward from the 2014 Sierra 1500, including new double cab and revised crew cab body styles. Larger rear doors on each, along with new seat designs, enable easier entry and exit from the rear seat and two inches of additional legroom on crew cabs. Additional new and enhanced features for the 2015 GMC Sierra HD lineup include CornerStep rear bumper, EZ Lift and Lower tailgate, StabiliTrak with Trailer Sway Control, integrated cruise control, auto grade braking and diesel exhaust braking, IntelliLink infotainment and more.

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.
Segment-leading capabilities across the range include the highest payload - 7,374 pounds - and the highest conventional trailering rating - 19,600 pounds. The maximum fifth-wheel trailering rating is 23,200 pounds. Gas and Duramax diesel powertrains are offered, including a bi-fuel option that pairs the gas engine with a compressed natural gas system. Bold styling and an all-new, more comfortable and technology-infused interior are carried forward from the 2014 Sierra 1500, including new double cab and revised crew cab body styles. Larger rear doors on each, along with new seat designs, enable easier entry and exit from the rear seat and two inches of additional legroom on crew cabs. Additional new and enhanced features for the 2015 GMC Sierra HD lineup include CornerStep rear bumper, EZ Lift and Lower tailgate, StabiliTrak with Trailer Sway Control, integrated cruise control, auto grade braking and diesel exhaust braking, IntelliLink infotainment and more.

GMC introduced a new generation of heavy-duty pickups in 2008, trying to keep its flag up despite the 2007 – 2009 world financial recession.
General Motors made the 3500HD lineup in a few body shapes, but some were addressed to the professionals. It was the heaviest truck before a CDL license was required and provided all the needs for a family. The Crew Cab version provided plenty of room on the rear seats to be used by a family of five going on a cross-country trip with a trailer in the back.

GM built the 3500HD version for work, and it showed it. Its front fascia was tall, fitted with big squared headlights and corner-mounted turn signals. Depending on the trim option, the front bumper was black, body-colored, or chromed. The Sierra 3500HD Crew Cab featured four regular-sized doors. Thanks to the side aluminum steps, it was easier for children to climb inside. GM built the four-door Sierra, with only one bed option, unlike its shorter-cabin brothers, which were available with a long or a short loading area.

Inside, GMC offered an option for a bench at the front, while most trim levels provided two buckets for the driver and side passenger and a bench for three in the back. The carmaker took its inspiration for the upper trim level (and some parts) from Cadillac and installed wood trims and powerful sound systems.

GMC claimed that the most demanded version was the diesel version with its 6.6-liter Duramax unit that came with enough torque to pull a house and, thanks to the engine braking system, it saved the brake pads. All engine versions sent their power to the rear or all four wheels. But that was mostly for the entire 3500HD range.

GMC focused on hard-working vehicles such as the one-ton pickup truck, named Sierra 3500 HD (Heavy-Duty), and managed to be recognized as one of the best-in-class vehicles.
The pickup-trucks have become more and more luxurious and focused on passengers’ comfort. But there was a select range of vehicles that offered more than just convenience. They were designed to carry heavy loads, pull trailers with equipment, and help the owner put bread and butter on the table. Unlike its siblings with four doors, the regular-cab version was designed mostly for work.

GM built the 3500 HD version for work, and it showed it. Its front fascia was tall, fitted with big squared headlights and corner-mounted turn-signals. Unusually for its class, the vehicle was available with a different pair of headlights with dual, horizontal lamps separated by a horizontal slat. Depending on the trim option, the front bumper was black, body-colored, or chromed. The Regular cab offered just two doors and a bench in the front, or individual seats depending on the trim level and options. GMC offered the Sierra with a choice of beds in the back or with a bare chassis.

Inside, GMC installed either a bench for three or two individual seats, depending on the trim levels. The WT (Work Truck – base model) featured rugged vinyl floor mats and stain-proof upholstery. The SLT, top trim-level, offered a higher comfort level with individual seats, wood-trims, and a sat-nav system.

GMC claimed that the most demanded version was the diesel version with its 6.6-liter Duramax unit that came with enough torque to pull a house and, thanks to the engine braking system, it saved the brake pads. All engine versions sent their power to the rear or all four wheels.

After a century of experience in building hard-working vehicles, GMC can claim a top spot in the full-size heavy-duty pickup trucks, and the 3500HD Extended Cab was proof.
The pickup-trucks have become more and more luxurious and focused on passengers’ comfort. But there was a select range of vehicles that offered more than just convenience. They were designed to carry heavy loads, pull trailers with equipment, and help the owner put bread and butter on the table. Unlike its siblings with four doors, the regular-cab version was designed mostly for work, while the Extended Cabs were the middle road where a small team of five could travel short distances for a job.

GM built the 3500HD version for work, and it showed it. Its front fascia was tall, fitted with big squared headlights and corner-mounted turn-signals. Depending on the trim option, the front bumper was black, body-colored, or chromed. The Sierra 3500HD Extended cab offered two doors at the front and a set of rear-hinged ones in the back. Like its Regular Cab version, it featured a choice of short or long beds.

Inside, GMC installed either a bench for three or two individual seats, depending on the trim levels. The WT (Work Truck – base model) featured rugged vinyl floor mats and stain-proof upholstery. The SLT, top trim-level, offered a higher comfort level with individual seats, wood-trims, and a sat-nav system. In the back, the carmaker placed a bench for up to three occupants.

GMC claimed that the most demanded version was the diesel version with its 6.6-liter Duramax unit that came with enough torque to pull a house and, thanks to the engine braking system, it saved the brake pads. All engine versions sent their power to the rear or all four wheels.