Silverado and Sierra are offered in a scope of 2500HD (three-quarter-ton) and 3500HD (one-ton) models, reaffirming GM's about 100-year heritage of building rock solid trucks. The 2007 models offer remarkable degrees of execution, capacity and refinement. Silverado is accessible in WT, LT and LTZ trim; Sierra is accessible in WT, SLE and SLT trim - all with separated appearance and insides.
"There's not a more extensive, all the more remarkable or progressively competent arrangement of substantial pickups in the business," said Gary White, GM North America VP and vehicle line official of full-size trucks. "However, alongside the capacity and usefulness that our clients expect, the 2007 Silverado and Sierra rock solid trucks merge uncommon refinement and astonishing scrupulousness."
The scope of setups - three taxi styles, three load box styles and five wheelbase lengths - conveys enormous decision. Some full-size truck makers don't much offer three-quarter-ton or one-ton substantial trucks. What's more, among those that do, the 2007 Silverado and Sierra HD pickups offer many portion best abilities, including 18,500-pound (8,392 kg) net joined vehicle weight rating for vehicles with a gas V-8 and a 13,000-pound (5,897 kg) ordinary trailer weight rating empowered by a bigger limit trailer hitch stage. Most extreme towing limit is 16,700 pounds (7,575 kg), when outfitted with a fifth-wheel hitch."GM's rock solid pickup legacy is based on the guarantees of capacity and reliability," said White. "The new Silverado HD and Sierra HD trucks offer remarkable capacity, while expanding on the notoriety that has put GM full-size pickups at the highest point of various quality reviews."
Chevy Silverado and GMC Sierra 2500HD and 3500HD models will show up in the primary quarter of 2007. Creation of the new trucks is shared among a few get together plants, including Fort Wayne , Ind. , and Pontiac and Flint , Mich. 
Intense and particular outside plans
The new Silverado and Sierra rock solid models have bolder, strong plans that are separated from their light-obligation kin. This incorporates new grilles, headlamps, hoods and front bumpers - all passing on expansive carried, prepared for-anything quality. The trucks likewise highlight more unmistakable brand separation than any past age.
Chevy Silverado has a more extensive and taller double port grille, with an unmistakable gold tie seal at the inside. Huge, reflector-optic headlamps and corner lights fold over the front end and stream into flared front bumpers, upgrading the truck's expansive position. The bumper flares have an etched, made right appearance and supplement the solid force vault hood structure.
GMC Sierra has a particular front end with a noticeable GMC seal set in an enormous, chrome-ringed grille (dark grille encompass on work truck models). The grille is flanked by enormous, jeweled-appearance headlamps. Chrome guards with body-shading top and end tops are standard. SLE models include enormous foglamps set into the guard, making an upscale appearance that further mirrors GMC's image personality.
The trucks' entryway handles highlight huge, get style plans that are anything but difficult to open with gloves. Different subtleties likewise improve the solid appearance and usefulness incorporates bigger front recuperation snares. A quicker, 57-degree windshield point diminishes wind clamor and improves eco-friendliness.
The trucks are progressively refined looking, as well, with entryways that stretch out over the rockers for a smooth, continuous look, and lights that have a jeweled appearance. Resistances between boards are significantly diminished - remembering a 50-percent decrease for the space between the taxi and payload box.
Taxi and payload box arrangements
Silverado and Sierra rock solid trucks are offered in customary, broadened and team taxi designs, which are supplemented with standard (6-foot 6-inch) and long (8-foot) freight box lengths. Silverado and Sierra 3500HD models likewise are accessible with the Dually double back wheel design on a long (8-foot) box. New highlights, for example, 170-degree-opening back access entryways with completely retractable force windows on broadened taxi models, offer expanded adaptability. 
The pickup boxes have been upgraded with improved adaptability, expanded quality and more noteworthy limit. A one-piece wheelhouse and internal box side include quality and a smoother, increasingly coordinated appearance. The containers are 1.18 inches (30 mm) more profound in the front and 1.57 inches (40 mm) more profound at the back, with more grounded inward dividers that offer improved exhibition when fitted with stepping stool racks, tool kits and different adornments. Payload bed volume is 60.7 cubic feet (1,718 L) with the normal box and 75.5 cubic feet (2,138 L) with the long box.
Dually cargo boxes are made of all steel, including new, hydroformed sheet metal outer fenders. They have a smooth, integrated appearance and enhanced strength. All Dually models feature marker lights on the fenders and new, sleek cab roof lights that are aerodynamically integrated into the top of the cab.
New tailgate designs include a lock and an available EZ Lift feature, with torque-rod assist. Despite being larger than previous models, the new tailgates are easier to use, thanks to revised construction that reduces overall mass. The tailgates are easily removed by simply opening to 45 degrees and pulling straight out and away from the vehicle.
A new, innovative cargo management system is available on all Silverado and Sierra models and is complemented by a range of dealer-ordered accessory packages. Three rails that run the length of the box sides and the forward box wall are secured with high-strength anchors and, unlike competitors' systems, incorporate upper and lower tracks. Four adjustable tie-down brackets are included with each system and can be located anywhere on the tracks, each rated for a load point of 500 pounds (227 kg).
At the heart of a comprehensive accessories portfolio for the new pickups is a group of specific accessory products designed to integrate into the cargo management system. The rails enable the use of an overhead utility rack rated at 500 pounds (227 kg) loading capacity, a sliding diamond plate toolbox, a sliding bed divider, diamond plate side storage boxes or a bicycle mount. These accessories use either the upper or lower rails, allowing numerous combinations that can easily fit together or bypass one another as they slide along the rails. The tool boxes and bicycle mount use a codeable lock, enabling the vehicle key to be used for locking and unlocking these accessories.
Segment-leading interior designs with superior craftsmanship
Chevy Silverado and GMC Sierra HD pickups are quieter, more spacious and refined inside, with increased passenger comfort and storage space. They each feature two new and distinct interior designs that reflect their respective brand identities, including specific trim, appointments and gauge cluster appearance.
Silverado and Sierra HD base and midlevel trim models include a functional pure pickup interior design theme with a contemporary adaptation of GM's ergonomic cockpit instrument panel design. In addition, this interior includes specific door panels with large door pull and release handles, new seat construction and configurations, unique center console and underseat storage systems, and two glove boxes (a traditional lower glove box and a covered upper storage compartment).
New luxury-inspired premium interiors are standard on Silverado LTZ and Sierra SLT. They offer richly appointed features, including a distinct instrument panel design, large-capacity center console (20.1 L), specific door panels, seats and other trim elements. Features on the premium interiors include power-adjustable heated bucket seats, leather surface seats, leather-covered steering wheel and selective chrome trim.
Spaciousness in each interior trim level is enhanced with new, "low and forward" instrument panels that provide a more airy feel to the cabin as well as a panoramic field of vision. The instrument panels are mounted approximately 3.5 inches (90 mm) down and forward on the pure pickup interiors, while the premium interior instrument panel is located 5 inches (127 mm) down and forward. Both instrument panel designs are integrated into their specific door panels to create a swept appearance.
The spacious interior and enhanced field of vision create an environment that enables better outward vision. Legroom, headroom and hip room also have increased. The recline angle and fore/aft travel of the front seat have been increased.
All interiors are refined and craftsmanship is highlighted by flush surfaces, tight gaps and tolerances on the instrument panel, center stack, clusters and other components. Most gaps on the instrument panels and clusters have been narrowed to 0.5 mm or less. Attention to detail was given to concealing fasteners and metal structural components of all seats. There is no exposed hardware in the interior or door sills. New, soft-touch and low-gloss finishes for the instrument panels and other trim pieces are used throughout. The color and grain of the materials were carefully selected to provide a premium look. Sculpted headliners of new woven fabric and door trim, as well as sculpted seat backs, enhance the perception of precision in the new interiors.
Complementing the interiors' finely crafted look and feel is segment-leading quietness. All trim levels - even base work truck models - benefit from a comprehensive system that delivers a passenger environment almost devoid of noise. This is achieved with the use of strategically placed sound-deadening and sound-absorbing material in the body structure - including liquid-applied dampener on the floor and front-of-dash - as well as the inherent, vibration-minimizing traits of the stiffer frame and quieter attributes of the aerodynamically tuned exterior. Also, improved door sealing and a doors-over-rockers design help eliminate road and wind noise.
Additional highlights of Chevy Silverado and GMC Sierra interiors include:
+ A new, stadium-style rear seat with a 60/40-split design and folding center arm rest can be easily folded up to provide an uninterrupted load floor. Or, either section of the split seat can be stowed independently, allowing room for both cargo and a rear-seat passenger.
+ A "double" glove box, which includes a large-capacity, traditional glove box and a new, covered storage compartment above it, with a 3.4-liter storage capacity.
+ Models equipped with the luxury-inspired premium interior come with a single large glove box that offers approximately 25 percent more storage capacity.
+ The premium interiors include large center consoles with the segment's largest storage capacity: 20.1 liters of undivided volume.
+ The pure pickup interiors feature a 6.1-liter armrest storage console and a new underseat storage bin built into a new 40/20/40-split bench seat. This 9.1-liter lockable storage bin, which includes an accessory power outlet, is located under the center seat cushion and is large enough to store a laptop computer.
+ The gauges have an analog display, with large, easy-to-read graphics. They are lit with ice-blue LED lighting, which provides crisp, bright illumination and a more upscale look. A driver information center is incorporated on the instrument panel.
+ A manual-control climate control system is standard on all models, with a dual-zone automatic system available. The dual-zone system allows for up to a 30-degree F difference in temperature settings between the driver and front passengers.
+ Power-operated rear side glass is featured on extended cab models. The windows lower completely into the rear access doors.
+ Power-operated back glass is available on extended and crew cab models. The window operates with the touch of a button located on the overhead console.
+ A large, power-operated sunroof is available on extended and crew cab models. The crew cab sunroof has a tilt/slide design, with a sliding sun shade and express open/close feature. The extended cab sunroof uses a spoiler-type sunroof design that slides back over the roof surface.
+ Ultrasonic Rear Parking Assist provides audible warnings of objects behind the vehicle.
+ A heated windshield washer fluid system more effectively removes bug spatter and thin layers of ice and frost. When the system is activated, washer fluid is heated to 150 degrees F (60 C) or more.
+ A diverse range of radio systems, including single-CD, six-disc, MP3- and DVD-capable systems, is available. Several radios feature RDS technology, which provides enhanced information for participating FM stations.
+ XM Satellite Radio is available.
+ A rear-seat entertainment system isavailable on crew cab models; it combines a dual-play radio system, rear-seat audio controls and a larger, eight-inch flip-down screen.
+ Two touch-screen DVD-based navigation radio systems are offered; one is specific for systems equipped with the rear-seat entertainment system.
+ A new generation OnStar feature that provides Turn-by-Turn Navigation commands is automatically downloaded into the driver information center.
Driving experience and capability
A new, Gen-IV 6.0L gasoline V-8 engine with variable valve timing and an enhanced, more powerful version of the Duramax 6.6L turbo-diesel are the engine choices for the Silverado and Sierra 2500HD and 3500HD models. Both engines offer segment-leading power and torque ratings. The gas engine is backed by a new, Hydra-Matic 6L90 six-speed automatic transmission, which features grade braking capability. Duramax-powered trucks are backed by the reknown six-speed Allison 1000 automatic transmission.
The standard engine is the new, 6.0L gas V-8. It is rated at a best-in-class 353 horsepower (233 kW) and 373 lb.-ft. of torque (506 Nm) on single rear wheel configurations.* Variable valve timing helps improve performance and fuel economy. A new, Hydra-Matic 6L90 six-speed automatic transmission is paired with the engine. This powertrain combination offers a higher maximum gross combined weight rating (GCWR) - 18,500 pounds (8,392 kg) - than previous gas-powered combinations and is the segment leader for vehicles with a small-block V-8 gas engine. The 6L90 has a wide, 6.04:1 overall ratio - including two overdrive gears - that helps deliver an excellent balance of performance and fuel economy. It also offers manual range selection and tap up/tap down control.
A cleaner, more powerful Duramax 6.6L turbo-diesel engine is available. It continues to lead the segment in power and torque, with power ratings increased to 365 horsepower (272 kW) and 660 lb.-ft. of torque (895 Nm). Upgrades to the engine and a new diesel particulate filter system help provide a 90-percent reduction in particulate matter and a 50-percent reduction in NOx (compared with current standards), meeting a new federal government mandate. All diesel manufacturers are required to meet the new emissions standard, starting in calendar year 2007.
The renowned Allison 1000 six-speed automatic transmission is partnered with the Duramax 6.6L turbo-diesel engine. It delivers good fuel economy, quietness and control. It features a class-first range selection function, which allows the driver to easily select the desired gears to match driving conditions, such as towing a trailer on a steep grade.
Working in concert with the powertrains are a strong chassis and responsive suspension systems. The vehicle frame is comprised of a sturdy ladder design that is reinforced with cross braces. It features a segmented design that enables easy and accurate adaptation of numerous lengths to accommodate the trucks' five wheelbase lengths. The frame sections are joined with strong, overlapping segments that bolster overall strength and rigidity.
The strength of the frame and enhanced capabilities enabled by the powertrain systems allow the 2007 Silverado and Sierra heavy-duty trucks to offer a larger, 2.5-inch trailer hitch receiver platform. This enables the trucks to pull a segment-leading maximum of 13,000 pounds (5,897 kg) with conventional trailers. Trucks with fifth-wheel hitches can tow up to 16,700 pounds (7,575 kg), when properly equipped.
Additional features:
+ All 2500HD and 3500HD models ride on a wide, 68.6-inch (1,742 mm) front track. The rear track on 2500HD trucks is 66 inches (1,676 mm); the rear track on 3500HD models is 74.7 inches (1,897 mm), giving Silverado and Sierra heavy-duty models a firmly planted feel.
+ Two suspension packages: Z85 and Z71. The Z85 suspension is standard on 2WD and 4WD models; the Z71 Off Road suspension is optional and includes additional chassis and suspension equipment, including skid plates.
+ A new steering control box is used with the recirculating ball steering system, delivering improved returnability for a greater feeling of control and on-center feel.
+ A high capacity, four-wheel disc brake system with Hydroboost and four-wheel ABS is standard on all models. The brake system includes large-diameter front and rear disc rotors and stiff brake calipers.
All heavy-duty models are available with an integrated trailer brake controller. It is integrated with the ABS system and provides immediate and measured brake force signaling to electric-controlled trailer brake systems. There is no requirement for external and/or aftermarket brake control systems. The brake controller switch is conveniently mounted on the lower-left section of the instrument panel.
Safety details
Silverado and Sierra heavy-duty models are designed to help drivers avoid crashes and protect passengers in the event one occurs. The robust ladder frame and strong body structure provide occupant protection. The frame is designed with crush zones that crumple to absorb crash energy, while the new body structure incorporates the strategic use of high-strength steel and structural adhesives designed to help maintain passenger compartment integrity and manage energy in a crash.
Additional safety features include:
+ Dual-stage frontal air bags are standard on all models.
+ Segment-first front safety belt pretensioners with both front and rear crash sensing.
+ A standard, high capacity four-wheel disc brake system with four-channel ABS system provides superior stopping capability.
+ A new Ultrasonic Rear Parking Assist system is available and provides visual (LED lights) and audible warnings of objects behind the vehicle.
+ Tire pressure monitoring system is standard on all models except Dually.
+ Segment-exclusive factory-installed remote vehicle starting system is available on most models.
+ Power-adjustable pedals complement increased front seat fore/aft travel to enable smaller-stature drivers to find an optimized driving position.
All retail models come standard with the OnStar Generation 7 system, including a one-year subscription to the Safe & Sound plan. The OnStar service includes the General Motors Advanced Automatic Crash Notification (AACN) system, making crash data available to emergency services to potentially dispatch the appropriate life-saving personnel and equipment to crash scenes faster. If the vehicle is in a crash that activates an air bag, the OnStar system automatically notifies an OnStar advisor, who will check on the occupants or summon emergency help if necessary. OnStar also can assist authorities in locating a vehicle if it is reported stolen and provides remote door-unlocking service (when the vehicle is equipped with power locks).
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