Made to deliver class - top capacity with smarter systems and increased comfort, the new 2015 GMC Sierra HD lineup improvements a heritage of specialist heavyduty trucks.

The new Sierra HDs get to the first-quarter of 2014, including 2500HD and 3500HD versions, and also the Sierra Denali HD, which matches doit-all capacity with an exclusive bundle of style and upscale interior comforts.

Section-top capacities around the range contain the highest payload - 7,374 lbs - and the highest normal trailering evaluation - 19,600 lbs. The most fifthwheel trailering evaluation is 23,200 pounds.

"Sierra HD trucks are designed without compromise to provide not just the capacity now's heavyduty truck customers need, however the quality and refinement that inspire confidence with each endeavor," said Tony DiSalle, vice-president of GMC Advertising. "We are doing this for over a century, and no one understands trucks like GMC."

Bold styling and an allnew, more comfortable and technologyinfused inside are carried forward in the 2014 Sierra 1500, including revised crew cab body designs and new double cab. Bigger rear doors on each, as well as new seat styles, permit easier entrance and departure in the rear seat and two inches of extra legroom on crew cabs.

"Forget the belief that heavyduty trucks are fundamental tools using a trailer hitch," said DiSalle.

Additional new and improved features for the 2015 GMC Sierra HD line:

CornerStep back fender, EZ Lift and conventional top tiedowns, Lower tailgate and other attributes which make freight handling simpler
Improved cooling airflow, which allows the Duramax turbo-diesel and 6. 0L full power to be better maintained by gas engine, even under heavy loads and high ambient temperatures
Latestgeneration IntelliLink infotainment setup, which offers many different connectivity choices for products of kinds and accessible navigation
The distinguishing Sierra Denali HD features exceptional interior decorative trimming, a touch Denali chrome grille, a polished stainless exhaust outlet (gas designs) and body - colour front and rear bumpers. Complementing the softtouch instrument panel trim and aluminum trim are Denalispecific interior details, including script to the glowing door sills and embossed to the front seats.

Sierra Denali's hightech inside also features an unique eightinch customizable driver screen that may show applicable settings, sound and navigation info within the instrument panel. Sierra Denali's standard eightinch Colour Touch navigation radio with Intellilink, situated over the middle console, functions as the primary hub for Bluetoothconnected phones and mobile devices linked through five standard USB ports.

GMC Sierra HD outdoor characteristics and layout

Sierra HD trucks get a fresh face that communicates GMC's professional-grade aesthetic with greater technical precision, including an allnew headlamp and grille design, electricity-dome hood - with particular badging on Duramax-equipped models - and a onepiece chrome bumper (body-colour bumper on Denali). SLT and Denali versions function GMC's signature C-formed LED daytime running lamps inside the headlamp housings.

Its bold, advanced styling is backed up by the new exterior design with efficiencyenhancing performance. As the newest grille design supports enhanced enginecooling operation, improved aerodynamics permit the trucks to slide through the atmosphere with less drag and decreased wind sound. It improves efficiency and ensures Sierra HD provides best performance under the conditions, like towing on the mountain grade.

Such as the 2014 Sierra 1500, the previous extended cab is replaced by a new double cab body. New structural B-pillars were added to increase a good sense.

Unlike trucks with rearhinged doors, Sierra's double-cab layout allows rear passengers to enter and leave the vehicle with all the front doors staying closed. Crew cabs function re-sized doors, also, including more rear doors, which likewise make it simpler to climb in and out-of the rear seat.

Roughly 67% of every cab is built with ultra and highstrength - highstrength steels, used in the A - pillars, B - rockers, pillars and roof rails, also strategic sections in the interior construction. Ultra high - strength steel is utilized in sections of the under-body and rocker panels to assist in improving performance in crashes.

Cargo box improvements

The new CornerStep back fender - launched on Sierra 1500 - is conventional. It features incorporated steps at every corner made to accommodate big boots, with textured pads for surefooted grip.

Sierra HD's containers also feature four incorporated freight tiedown provisions included in the lower corners and brand new, conventional top tiedowns.

An internal torsion-bar inside the tailgate lowers the effort to lift and lower it, though a damper enables a managed and much more slow lowering movement when opening. The tailgate can also be, easily removable without tools.

LED freight box lighting is normal on SLT, SLE and Denali versions.

The boxes feature a 2-grade loading style while offering over four-feet of loading space between the wheel houses, enabling conventional 4' x 8' sheets of plywood to pile flatly in the box floor. There's also greater than five-feet of load space between the carton walls. An available, factoryinstalled spray-in bed liner offers protection for the box floor and walls.

The 2-grade design enables clients to fit a stage to distinguish things during hauling or hide valuables below, like power tools. It includes resting points at exactly the same amount as the tops of the wheel properties - empowering the stage to efficiently break up the carton into top and lower segments. Additionally, there are built-in provisions for freight bulkheads to subdivide the box even farther.

A broad variety of utilityenhancing add-ons provided through GMC dealers makes Sierra HD freight boxes more operational. They comprise bed liners, tool boxes, bed mats, carton nets, ladder racks and much more.

2015 GMC Sierra Denali HD walkaround review

Intuitive, integrated inside

The 2015 Sierra HD lineup advantages from inside launched to the 2014 Sierra 1500.

As the buttons and knobs are big, an erect instrument panel is made for visibility and availability. All knobs are coated by means of a rubberover-form engineering which makes them easy-to grasp, even with gloves.

A fresh instrument cluster on all versions features six gauges with an accessible centrally located, 4.2inch-diagonal colour driver info centre, with vehicle standing details, a trip computer and radio and navigation readouts.

Over the center stack and center console are added cupholders, unobtrusive compartments big enough for most laptops, and connectivity options. Sierra HD is accessible with 110volt outlet, up-to four 12volt outlets, five USB ports and a SD-CARD slot.

Available IntelliLink connectivity uses a reconfigurable eightinch colour touchscreen with a simple and intuitive layout - toread icons that control a Pandora application, sound features, Bluetooth mobile functions and available navigation with allnew map screens. Most of the system's characteristics could be controlled by naturallanguage voice-command, enabling drivers to keep their eyes on the street and hands on the wheel.

Sierra HD's seats use double-density foam made to remain comfy over-long hours and keep to appear great after years of use. Leather-chosen and cloth chairs can be found, and Sierra's new highwear cloth was created to last longer and resist staining.

Heavyduty basis for higher abilities

All Sierra HD versions feature completely boxed frame assemblies - 18 distinct assemblies that adapt more than 150 potential vehicle configurations over the lineup. Strategic improvements support greater capacities, including:

Section-leading maximum payload of 7,374 lbs
Section-top normal towing rating of up-to 19,600 lbs (with factoryinstalled, framemounted boxtube hitch)
Maximum fifthwheel towing rating of 23,200 pounds.
A shortlong arm/torsion bar front suspension is utilized on all models and features forged-steel upper control arms and precisionmachined cast-iron lower control arms.

In the back, an asymmetrical leafspring layout improves traction-control effectiveness and minimizes axle hop. A twostage leafspring layout is utilized on 2500HD models and threestage design is applied on 3500HD version. All models feature 3-inchwide (76 mm) leaf-springs.

The Z71 Off Road suspension is accessible on SLT and SLE versions and comprises 35mm deflective disk twintube shock-absorbers, offroad jounce bumpers, 33mm front stabilizer bar plus a skid plate package.

Vehicle management systems

GMC Sierra HD's complex vehicle control systems are made to make difficult jobs simpler and much more comfortable, while also contributing to a secure driving experience, specially when hauling freight or towing a trailer.

StabiliTrak electronic stability-control is normal on all singlerear - 3500HD double - rearwheel models - wheel models and - new for 2015. It features trailer rock control and hill-start aid.

Accessible cruise-control, auto grade braking, and diesel exhaust brake characteristics help the vehicle keep a set rate up and down grades, even if towing a heavy trailer. With the diesel exhaust brake function, the turbocharger is utilized to quietly and easily create added backpressure within the engine to help impede the automobile. The mix of the automatic transmission downshifts and also the exhaust brake helps the driver keep the required rate, even on steep grades.

A back - vision camera system is standard on SLT, SLE and Denali to provide a view to the driver of things on the other side of the automobile. Additionally, it may help with lining up in-front of the trailer.

Proven powertrains

A Vortec 6.0L gas V-8 with variable-valve timing is matched with the HydraMatic 6L90 sixspeed automatic transmission while the conventional powertrain over the Sierra HD version range. This blend is engineered to produce efficiency and exceptional performance, notably at low - rpms. It's rated at 380 lbft (515 Nm) and 380 lbft of torque (515 Nm) in 322 horsepower and 2500HD models (240 kW) and 360 horsepower (268 kW) in 3500HD.

The 6.0L engine is also accessible a bifuel model which includes particular tempered valves and valve seats that allows it to operate on compressed natural-gas or petrol. The CNG fuel-system is installed with a GM supplier and finished vehicles are delivered right to the client, making the purchase process as seamless as purchasing another alternative.

The Duramax 6. 6L diesel and Allison 1000 sixspeed automatic transmission powertrain combination is accessible on all 3500HD and 2500HD versions, with highlights that contain:

397 hp (296 kW) at 3,000 rpm
Variable vane turbocharger which also functions as an exhaust brake to assist manage or impede the automobile's rate
B20 biodiesel capacity for an alternative fueling option.
The Allison 1000 attributes driver shift control with tap up/tap down-shifting and a patented raised idle mode taxi warmup attribute.

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