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GMC released the official details on its 2015 Sierra HD lineup, which so happens to align perfectly with Ford revealing its competitor: the 2015 F-Series Super Duty. The model comes with a choice of two engines, two automatic transmission, an updated exterior look and an all-new, more comfortable and technology-infused interior — carried over from the 2014 Sierra 1500.

GMC specially designed the all-new exterior in the wind tunnel to reduce wind noise and enhance powertrain cooling for more consistent performance. GMC also worked hard on the interior to make it quieter and more comfortable, with ample storage for work or travel and the intuitive connectivity of IntelliLink.

The 2015 GMC Sierra HD will be put on sale in the first quarter of 2014. Customers can choose from three models — 2500HD, 3500HD models and Denali HD — 18 different assemblies and more than 150 possible vehicle configurations. This should give customers plenty of freedom to build a Sierra HD that fits their needs perfectly.

Click past the jump to read more about the GMC Sierra HD.

  • 2015 GMC Sierra HD
  • Year:
  • Make:
  • Model:
  • Engine:
  • Transmission:
    Hydra-Matic 6L90 6-speed auto
  • Horsepower @ RPM:
    360 @ 5400
  • Torque @ RPM:
    380 @ 4200
  • Displacement:
    6.0 L
  • 0-60 time:
    8 sec. (Est.)
  • Top Speed:
    110 mph (Est.)
  • car segment:
  • body style:


2015 GMC Sierra HD High Resolution Exterior
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2015 GMC Sierra HD High Resolution Exterior
- image 526088
2015 GMC Sierra HD High Resolution Exterior Wallpaper quality
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For 2015, GMC updated the Sierra HD with a new face that features an all-new headlamp and grille design, a power-dome hood and a one-piece chrome bumper. All of these changes not only give the Sierra a fresher look, but they also help its aerodynamics.

The Sierra HD’s new grille ensures a better cooling for the new line of engines, while new inlaid doors help reduce wind noise. GMC also added a new roof design and a tailgate spoiler to improve aerodynamic efficiency.

For 2015, the now-discontinued extended cab is replaced by a new Double Cab, which features longer, front-hinged rear doors with outside pull handles at the rear and new structural B-pillars.

GMC wanted to increase the safety of its work-tuned pickups, so built 67 percent of the cab is made out of high-strength and ultra-high-strength steels, including the A-pillars, B-pillars, rockers and roof rails, as well strategic sections on the interior structure.

2015 GMC Sierra HD - Exterior Dimensions

Regular Cab Long Box Double Cab Standard Box Double Cab Long Box Crew Cab Standard Box Crew Cab Long Box
Wheelbase (in / mm): 133.5 / 3393 144.1 / 3662 158.1 / 4017 153.7 / 3904 167.6 / 4259
Overall length (in / mm): 224.3 / 5699 230 / 5841 248.8 / 6321 239.5 / 6083 258.4 / 6563
Overall width (in / mm): 80.1 / 2035 80.5 / 2045 80.5 / 2045 80.5 / 2045 80.5 / 2045
Overall height – 2WD: (in / mm): 77.8 / 1976 78.1 / 1984 77.9 / 1978 78.3 / 1988 78 / 1981
Overall height – 4WD: (in / mm): 77.7 / 1975 78 / 1983 77.8 / 1977 78.3 / 1987 79.9 / 1980


2015 GMC Sierra HD Interior Exterior
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2015 GMC Sierra HD Interior
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2015 GMC Sierra HD Interior
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GMC rolled the interior over from the all-new 2014 Sierra 1500. It includes premium materials, greater attention to detail and specially designed technologies. The instrument panel was designed to offer the best visibility and accessibility, while a new instrument cluster features six gauges with an available centrally located, 4.2-inch-diagonal color driver information center.

As expected the 2015 Sierra HD will offer lots of storage spaces, cup holders, discreet compartments large enough for most laptop computers, and connectivity options.

2015 GMC Sierra HD - Interior Dimensions:

Regular Cab Double Cab Crew Cab
Headroom (in / mm): 42.8 / 1087 front: 42.8 / 1087
rear: 38.7 / 982
front: 42.8 / 1087
rear: 40.5 / 1029
Legroom (in / mm): 45.3 / 1150 front: 45.2 / 1150
rear: 34.6 / 880
front: 45.3 / 1150
rear: 40.9 / 1040

Sierra HD Denali

2015 GMC Sierra HD Emblems and Logo Exterior
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The Sierra HD Denali model is distinguished by the signature Denali chrome grille, unique interior decorative trim, a polished stainless-steel exhaust outlet (gas models), and body-color front and rear bumpers.

As standard features, the 2015 Sierra HD Denali adds an exclusive 8-inch customizable driver display, projector-style headlamps with LED signature daytime running lights, a Bose audio system, heated and cooled leather front bucket seats, a heated steering wheel, and a power sliding rear window with defogger.


2015 GMC Sierra HD High Resolution Exterior
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For 2015, the Sierra HD is offered with a choice of two engines. The base engine is a Vortec 6.0-liter, V-8 that delivers a total of 360 horsepower and 380 pound-feet of torque in the 2500HD models and 322 horsepower and 380 pound-feet in 3500HD. The base V-8 teams up with a Hydra-Matic 6L90 six-speed automatic transmission.

Optional across the entire HD lineup is a Duramax 6.6-liter, turbo-diesel engine that delivers a total of 397 horsepower and 765 pound-feet of torque.This stump-pulling torque monster makes use of the heavy-duty Allison 1000, six-speed auto-box.

2015 GMC Sierra HD - Drivetrain Specifications

6.0L VVT V-8 – gas/E85 or bi-fuel Duramax 6.6L turbo-diesel
Engine type OHV gasoline or bi-fuel V-8 with variable valve timing OHV turbo-diesel with Piezo-actuated fuel system and variable-vane turbo
Horsepower (hp / kW @ rpm) 360 / 268 @ 5400 (2500HD)
322 / 240 @ 4400 (3500HD)
397 / 296 @ 3000
Torque (lb-ft / Nm @ rpm) 380 / 515 @ 4200 (2500HD & 3500 HD) 765 / 1037 @ 1600
Transmission Hydra-Matic 6L90 6-speed auto. Allison 1000 6-speed auto
Final drive ratio 4.10 or 3.73 3.73

Suspension and Brakes

2015 GMC Sierra HD Exterior
- image 526082

Depending on the model, buyers can order the 2015 Sierra HD with 17-, 18- or 20-inch wheels. All models are offered with short-long arm/torsion bar front suspension that features forged-steel upper control arms and precision-machined, cast-iron lower control arms.

GMC also offers an optional Z71 Off Road suspension that includes 35 mm (1.37-inch) deflective-disk, twin-tube shock absorbers; off-road jounce bumpers; a 33 mm (1.29-inch) front stabilizer bar; and a skid plate package. All models will be offered with StabiliTrak electronic stability control featuring trailer sway control and hill start assist.

2015 GMC Sierra HD - Capacities:

2500HD 3500HD
Max payload (lb / kg): 4,306 / 1,953 7,374 / 3,508
Max conventional trailing (lb / kg): 14,500 / 6,577 19,600 / 8,890
Max 5th wheel trailering (lb / kg): 17,900 / 8,119 23,200 / 10,523


Prices for the 2015 GMC Sierra HD will be announced closer to its market launch.


Ford F-Series Super Duty

2014 Ford F-Series Super Duty Exterior
- image 524419

On the same day as the 2015 GMC Sierra HD, Ford also launched the 2015 F-Series Super Duty. Ford’s updated its HD lineup with a new engine, which is a second-generation, 6.7-liter, Power Stroke V-8 turbo-diesel engine that delivers a total of 400 horsepower and 800 pound-feet of torque. The engine is mated to a 6R140 TorqShift® six-speed transmission.

We are hard at work on a review for this model, so stay tuned for full detail on the 2015 Ford F-Series Super Duty.

Ram Heavy Duty

2014 Ram Heavy Duty High Resolution Exterior
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The 2014 Ram Heavy Duty is offered in 2500HD and 3500HD versions and with a pair of available engines. Ram added a new 6.4-liter, HEMI V-8 engine that delivers a total of 410 horsepower and 429 pound-feet of torque as the base setup.

There is also an optional Cummins 6.7-liter, in-line-six turbo-diesel engine that delivers a total of 350 horsepower and 660 pound-feet of torque.

The Ram HD line starts just below $30,000.


2015 GMC Sierra HD High Resolution Exterior
- image 526080

With all the revisions received for the 2015 model year, the GMC Sierra HD could simply become the truck it should have been from the start. Depending on the pricing, the GMC Sierra HD could possibly give the Ford F-Series Super Duty fits, and further bury the Ram HD lineup.

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Alina Moore
Alina Moore
Alina Joined the team in the early 2000s as one of the outlets very first experts, and she’s been with ever since. Over the years, she’s served various roles, but today she’s is relied on heavily to verify automotive facts, assist with formatting, and discover new and engaging topics.  Read full bio
About the author

Press Release

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.

2015 GMC Sierra HD High Resolution Exterior
- image 526080

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.

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.

“Sierra HD trucks are engineered without compromise to deliver not only the capability today’s heavy-duty truck customers demand, but the quality and refinement that inspire confidence with every task,” said Tony DiSalle, vice president of GMC Marketing. “We’ve been doing this for more than a century, and nobody knows trucks like GMC.”

2015 GMC Sierra HD Exterior
- image 526081

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.

The new interior is also designed to help drivers and passengers whether they’re on the job or on a weekend getaway, with easier-to-reach, more intuitively located controls, more storage compartments, more plug-ins for electronic devices and the latest-generation GMC IntelliLink infotainment system – with an eight-inch-diagonal color touch screen.

“Forget the notion that heavy-duty trucks are basic tools with a trailer hitch,” said DiSalle. “The 2015 Sierra HD trucks can haul the heaviest load with unmatched comfort and technology that make the job easier.”

Additional new and enhanced features for the 2015 Sierra HD lineup:

CornerStep rear bumper, EZ Lift and Lower tailgate, standard upper tie-downs and other features that make cargo handling easier
Standard StabiliTrak with Trailer Sway Control on all models, including 3500HD dually
Integrated cruise control, auto grade braking and diesel exhaust braking (diesel models), for greater driving control and reduced brake wear on grades
Enhanced cooling airflow, which enables the Duramax turbo diesel and 6.0L gas engine to better maintain full power, even under heavy loads and high ambient temperatures
Latest-generation IntelliLink infotainment system, which offers a variety of connectivity options for devices of all types and available navigation

Sierra Denali HD details

The distinctive Sierra Denali HD features a signature Denali chrome grille, unique interior decorative trim, a polished stainless steel exhaust outlet (gas models) and body-color front and rear bumpers. Complementing the soft-touch instrument panel trim and aluminum trim are Denali-specific interior details, including script on the bright door sills and embossed into the front seats.

Sierra Denali’s high-tech interior also features an exclusive eight-inch customizable driver display that can show relevant settings, audio and navigation information in the instrument panel. Sierra Denali’s standard eight-inch Color Touch navigation radio with Intellilink, located above the center console, serves as the main hub for Bluetooth-connected phones and portable devices connected through five standard USB ports.

Other features standard on Sierra Denali include projector-style headlamps with light-emitting diode signature daytime running lights, a Bose audio system, heated and cooled leather front bucket seats, a heated steering wheel and a power sliding rear window with defogger.

Sierra HD design and exterior features

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). SLT and Denali models feature GMC’s signature C-shaped LED daytime running lamps within the headlamp housings.

2015 GMC Sierra HD Exterior
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The new exterior design backs up its bold, advanced styling with efficiency-enhancing functionality. Improved aerodynamics allow the trucks to slip through the air with less drag and reduced wind noise, while the new grille design supports enhanced engine-cooling performance. It enhances efficiency and ensures Sierra HD delivers optimal performance under the toughest conditions, such as towing on a mountain grade.

New inlaid doors, which fit into recesses in the bodyside, help reduce wind noise for a quieter cab, while details including like the roof and tailgate spoiler were tuned in the wind tunnel to smooth airflow over the truck for reduced noise and improved aerodynamic efficiency.

Like the 2014 Sierra 1500, a new double cab body replaces the previous extended cab. It features longer, front-hinged rear doors with outside pull handles at the rear, providing improved access in tight parking spaces. New structural B-pillars were added to add to a solid feel.

Unlike trucks with rear-hinged doors, Sierra’s double cab design allows rear passengers to enter and exit the vehicle with the front doors remaining closed. Crew cabs feature resized doors, too, including longer rear doors, which also make it easier to climb in and out of the rear seat.

Approximately 67 percent of each cab is constructed with high-strength and ultra-high-strength steels, used in the A-pillars, B-pillars, rockers and roof rails, as well strategic sections on the interior structure. Ultra-high-strength steel is used in areas of the rocker panels and underbody to help improve performance in crashes.

Cargo box innovations

Sierra HD models are available with 6’6” and 8’ box lengths that are stronger and more durable, easier to use and offer greater cargo flexibility. The new CornerStep rear bumper – introduced on Sierra 1500 – is standard. It features integrated steps at each corner designed to accommodate large boots, with textured pads for sure-footed grip.

Sierra HD’s boxes also feature four integrated cargo tie-down provisions built into the lower corners and new, standard upper tie-downs. The patented upper hooks – each rated at 250 pounds – can be placed in several locations around the upper bed rails, providing flexibility for securing loads of all shapes and sizes.

The EZ Lift-and-Lower tailgate is standard on SLE, SLT and Denali models. An internal torsion bar in the tailgate reduces the effort to raise and lower it, while a rotary damper allows for a controlled and more gradual lowering motion when opening. The tailgate is also easily removable without tools.

LED cargo box lighting is standard on SLE, SLT and Denali models. Two LED lights are mounted under the box side rails and are activated by a switch on the instrument panel, providing a light source when a tonneau cover is installed or a flashlight isn’t available.

The boxes come with a two-tier loading design and offers more than four feet of loading space between the wheel houses, allowing standard 4’ x 8’ sheets of plywood to stack flatly on the box floor. There is also more than five feet of load space between the box walls. An available, factory-installed spray-in bed liner provides protection for the box floor and walls.

The two-tier design allows customers to insert a platform to separate items during hauling or conceal valuables below, such as power tools. It incorporates resting points at the same level as the tops of the wheel houses – enabling the platform to effectively divide the box into upper and lower sections. There are also built-in provisions for cargo bulkheads to subdivide the box even further.

A wide range of utility-enhancing accessories offered through GMC dealers makes Sierra HD cargo boxes more functional. They include tool boxes, bed liners, bed mats, box nets, ladder racks and more.

Intuitive, integrated interior

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.

An upright instrument panel is designed for visibility and accessibility, while the knobs and buttons are large. All knobs are coated using a rubber-over-mold technology that makes them easy to grip, even with gloves.

A new instrument cluster on all models features six gauges with an available centrally located, 4.2-inch-diagonal color driver information center, with vehicle status details, a trip computer and radio and navigation readouts.

A second, high-mounted glove box with a flat floor joins the traditional box below. Each of Sierra HD’s doors has storage crafted to hold most beverage containers and other personal items. Along the center stack and center console are additional cupholders, discreet compartments large enough for most laptop computers, and connectivity options. Sierra HD is available with a 110-volt outlet, up to five USB ports, four 12-volt outlets and an SD card slot.

Available IntelliLink connectivity uses a reconfigurable eight-inch color touch screen with an intuitive layout and easy-to-read icons that control audio features, a Pandora app, Bluetooth phone features and available navigation with all-new map displays. Many of the system’s features can be controlled by natural-language voice command, allowing drivers to keep their eyes on the road and hands on the wheel.

Sierra HD’s seats use dual-density foam designed to stay comfortable over long hours and continue to look great after years of use. Leather-appointed and cloth seating are offered, and Sierra’s new high-wear cloth is designed to last longer and resist staining.

Heavy-duty foundation for greater capabilities

All Sierra HD models feature fully boxed frame assemblies – 18 different assemblies that accommodate more than 150 possible vehicle configurations across the lineup. Strategic enhancements support greater capabilities, including:

2015 GMC Sierra HD Emblems and Logo Exterior
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Segment-leading maximum payload of 7,374 pounds
Segment-leading conventional towing rating of up to 19,600 pounds (with factory-installed, frame-mounted box-tube hitch)
Maximum fifth-wheel towing rating of 23,200 pounds.

A short-long arm/torsion bar front suspension is used on all models and features forged steel upper control arms and precision-machined cast iron lower control arms. Five different torsion bar rates support five different front gross axle weight ratings to help stabilize the range of trim heights of various models under load – including snow plows – while enhancing appearance, handling, durability, tire wear and alignment.

At the rear, an asymmetrical leaf-spring design minimizes axle hop and enhances traction control efficiency. A two-stage leaf-spring design is used on 2500HD models and three-stage design is employed on 3500HD model. All models feature 3-inch-wide (76 mm) leaf springs.

The Z71 Off Road suspension is available on SLE and SLT models and includes 35mm deflective disk twin-tube shock absorbers, off-road jounce bumpers, 33mm front stabilizer bar and a skid plate package.

Vehicle control technologies

Sierra HD’s advanced vehicle control technologies are designed to make tough jobs easier and more comfortable, while also contributing to a safe driving experience, particularly when hauling cargo or towing a trailer.

StabiliTrak electronic stability control is standard on all single-rear-wheel models and – new for 2015 – 3500HD dual-rear-wheel models. It incorporates trailer sway control and hill start assist. Trailer sway control provides an added measure of confidence when towing a trailer by automatically intervening with braking and/or reduced engine power to bring the trailer under control and keep it on its intended path.

Hill start brake assist senses potential “rollback” when braking on an incline and holds full brake pressure momentarily after the driver lifts his or her foot from the pedal, preventing rollback – it is particularly effective when towing, giving the driver time to switch from the brake pedal to the gas pedal.

Available cruise control, auto grade braking, and diesel exhaust brake features help the vehicle maintain a set speed up and down grades, even when towing a heavy trailer. With the diesel exhaust brake feature, the turbocharger is used to smoothly and quietly create additional backpressure in the engine to help slow the vehicle. The combination of the exhaust brake and the automatic transmission downshifts helps the driver maintain the desired speed, even on steep grades.

Additional driver control features include four-wheel disc brakes, which are standard on all models, and four-wheel, four-channel ABS, which is standard on all single- and dual-rear-wheel models.

A rear-vision camera system is standard on SLE, SLT and Denali to give the driver a view of items behind the vehicle. It can also assist with lining up in front of a trailer.

Proven powertrains

A Vortec 6.0L gas V-8 with variable valve timing is matched with the Hydra-Matic 6L90 six-speed automatic transmission as the standard powertrain across the Sierra HD model range. This combination is engineered to deliver excellent performance and efficiency, especially at low-rpms. It is rated at 360 horsepower (268 kW) and 380 lb-ft of torque (515 Nm) in 2500HD models and 322 horsepower (240 kW) and 380 lb-ft (515 Nm) in 3500HD.

The 6.0L engine is also available in a bi-fuel model that features special hardened valves and valve seats that enables it to run on compressed natural gas or gasoline. The CNG fuel system is installed by a GM supplier and completed vehicles are delivered directly to the customer, making the purchase process as seamless as ordering any other option.

The Duramax 6.6L diesel and Allison 1000 six-speed automatic transmission powertrain combination is available on all 2500HD and 3500HD models, with highlights that include:

2015 GMC Sierra HD Emblems and Logo Exterior
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397 horsepower (296 kW) at 3,000 rpm
765 lb-ft of torque (1,037 Nm) at 1,600 rpm
High-pressure (30,000 psi/2,000 bar) Piezo-actuated fuel system for greater fuel efficiency, improved performance and reduced emissions
Variable vane turbocharger that also acts as an exhaust brake to help control or slow the vehicle’s speed
Selective catalytic reduction after-treatment system using diesel exhaust fluid injection to provide the best overall diesel characteristics and performance – with a range of about 5,000 miles (8,000 km) between DEF refills
Combustion and after-treatment optimized to provide about 700 miles (1,125 km) between diesel particulate filter regenerations
B20 biodiesel capability for an alternative fueling option.

The Allison 1000 features driver shift control with tap up/tap down shifting and a patented elevated idle mode cab warm-up feature. Also, the tow/haul mode reduces shift cycling for better control and improved cooling when towing or hauling heavy loads.

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Press release

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