From GM:

2007 CHEVROLET SILVERADO AND GMC SIERRA HEAVY-DUTY PICKUPS DELIVER THE CAPABILITY FOR ANY TASK
Distinct Designs, New Interiors and Class-Leading Powertrains Reaffirm GM’s Legacy of Strength

2007 HEAVY-DUTY PICKUPS AT A GLANCE

Depth and breadth of lineup:

-2500HD (three-quarter-ton) and 3500HD (one-ton) models – including “Dually” dual rear wheel configuration – with 2WD and 4WD
-Three cab styles: regular, extended and crew cab
-Three box configurations: standard (6-foot 6-inches) and long (8-foot); and Dually long (8-foot)
-Choice of gas and diesel engines with fuel-saving six-speed automatic transmissions on all models
-Retuned Z85 smooth ride suspension and new Z71 Off Road package – first time for Z71 on heavy-duty models
-Distinct trim offerings, including two different interiors
-Segment-best gross combined weight rating of 18,500 pounds (8,392 kg) with 6.0L gas V-8
-Segment-best conventional trailer maximum weight rating of 13,000 pounds (5,897 kg)
Production begins first quarter of 2007

Strong exterior designs:

-Bold, strong exterior designs differentiated from light-duty models
-Brand-differentiated designs with unique front-end appearances including unique hoods, front fenders, grilles and headlamps, and differentiated taillamps and pickup box designs
-Refined appearance with tighter tolerances and reduced body gaps including 50-percent tighter gap between cab and box
-Sleeker, more aerodynamic 57-degree windshield angle
-New 170-degree-opening rear access doors on extended cab models
-Range of 16-inch and all-new 17-inch wheels and tires

Spacious and functional interiors:

-Two all-new, distinct and spacious interior designs with superior craftsmanship
-“Pure pickup” interior with unique instrument panel, seats, door panels, consoles, double glove boxes, trim and features on Silverado WT, LT and Sierra WT, SLE models
-Luxury-inspired interior with unique instrument panel, seats, console, glove box, door panels, trim and features on Silverado LTZ and Sierra SLT models
-Use of premium materials with lower gloss levels
-Flush fits and close-outs that conceal seat hardware
-Instrument panels positioned down and forward for increased visibility and spaciousness
-Increased storage capacity in center consoles and glove boxes
-Innovative underseat storage on pure pickup interior
-Quiet interior achieved with extensive use of noise-reducing materials, spray-on damping, foam and seals

Exceptional driving experience:

-Standard Gen IV 6.0L V-8 gas engine with variable valve timing and class-leading power and torque (353 hp / 373 lb.-ft.)
-Optional Duramax 6.6L turbo-diesel engine with dramatic reduction in emissions and class-leading power and torque (365 hp / 660 lb.-ft.)
-Fuel-saving, technically advanced six-speed automatic transmissions, including new Hydra-Matic 6L90 with gas engine
-Strong ladder frame with hydroformed front section
-New steering gear improves returnability and enhances on-center feel
-Robust four-wheel disc brake system with standard ABS
-New integrated trailer brake controller

Comprehensive safety and security:

-Enhanced body structure with strategic placement high-strength steel and structural adhesives for crash protection
-360-degree perimeter of safety protection, including industry-exclusive rear impact sensors
-Front safety belt pretensioners that are triggered in front and rear impacts – an industry exclusive
-Dual-stage frontal air bags
-Tire pressure monitoring system
-Ultrasonic Rear Parking Assist
-Standard OnStar

Unique features and options:

-170-degree-opening rear access doors on extended cab models with fully retractable rear power windows
-EZ Lift tailgate with torque-rod assistance and lock
-Power sliding rear window (extended and crew cabs)
-Theater-style folding rear seats for ease of loading cargo
-Innovative cargo management system with comprehensive array of accessories
-Remote vehicle starting system
-Enhanced DVD entertainment system with larger screen
-New CD/MP3 radio family
-Touch-screen navigation system
-Heated windshield washer fluid
-OnStar 7.0 with Turn-by-Turn Navigation capability


DETROIT – General Motors introduces the new 2007 Chevrolet Silverado and GMC Sierra heavy-duty pickups, with all-new and differentiated exterior designs, two unique interiors and class-leading power and efficiency. The redesigned pickups incorporate brand-distinct exterior and interior designs that are greatly differentiated from the light-duty trucks, along with a choice of gas and diesel powertrains. Capabilities are enhanced and complement new, segment-leading and segment-exclusive features.

Silverado and Sierra are offered in a range of 2500HD (three-quarter-ton) and 3500HD (one-ton) models, reaffirming GM’s nearly 100-year legacy of building heavy-duty trucks. The 2007 models offer unprecedented levels of performance, capability and refinement. Silverado is available in WT, LT and LTZ trim; Sierra is available in WT, SLE and SLT trim – all with differentiated appearance and interiors.

“There’s not a broader, more powerful or more capable lineup of heavy-duty pickups in the industry,” said Gary White, GM North America vice president and vehicle line executive of full-size trucks. “But along with the capability and functionality that our customers expect, the 2007 Silverado and Sierra heavy-duty trucks meld exceptional refinement and surprising attention to detail.”

The range of configurations – three cab styles, three cargo box styles and five wheelbase lengths – delivers tremendous choice. Some full-size truck manufacturers do not even offer three-quarter-ton or one-ton heavy-duty trucks. And among those that do, the 2007 Silverado and Sierra HD pickups offer many segment-best capabilities, including 18,500-pound (8,392 kg) gross combined vehicle weight rating for vehicles with a gas V-8 and a 13,000-pound (5,897 kg) conventional trailer weight rating enabled by a larger-capacity trailer hitch platform. Maximum towing capacity is 16,700 pounds (7,575 kg), when equipped with a fifth-wheel hitch.

“GM’s heavy-duty pickup heritage is built on the promises of function and dependability,” said White. “The new Silverado HD and Sierra HD trucks offer exceptional capability, while building on the reputation that has put GM full-size pickups at the top of numerous quality surveys.”

Chevy Silverado and GMC Sierra 2500HD and 3500HD models will arrive in the first quarter of 2007. Production of the new trucks is shared among several assembly plants, including Fort Wayne , Ind. , and Pontiac and Flint , Mich.

Bold and distinctive exterior designs

The new Silverado and Sierra heavy-duty models have bolder, muscular designs that are differentiated from their light-duty siblings. This includes new grilles, headlamps, hoods and front fenders – all conveying broad-shouldered, ready-for-anything strength. The trucks also feature more distinct brand differentiation than any previous generation.

Chevy Silverado has a wider and taller dual-port grille, with a prominent gold bow tie emblem at the center. Large, reflector-optic headlamps and corner lights wrap around the front end and flow into flared front fenders, enhancing the truck’s broad stance. The fender flares have a chiseled, squared-off appearance and complement the strong power dome hood design.

GMC Sierra has a distinctive front end with a prominent GMC emblem set in a large, chrome-ringed grille (black grille surround on work truck models). The grille is flanked by large, jeweled-appearance headlamps. Chrome bumpers with body-color top and end caps are standard. SLE models feature large foglamps set into the bumper, creating an upscale appearance that further reflects GMC’s brand identity.

The trucks’ door handles feature large, grab-style designs that are easy to open with gloves. Other details also enhance the strong appearance and functionality includes larger front recovery hooks. A faster, 57-degree windshield angle reduces wind noise and improves fuel efficiency.

The trucks are more refined looking, too, with doors that extend over the rockers for a smooth, uninterrupted look, and lamps that have a jeweled appearance. Tolerances between panels are greatly reduced – including a 50-percent reduction in the space between the cab and cargo box.

Cab and cargo box configurations

Silverado and Sierra heavy-duty trucks are offered in regular, extended and crew cab configurations, which are complemented with standard (6-foot 6-inch) and long (8-foot) cargo box lengths. Silverado and Sierra 3500HD models also are available with the Dually dual rear wheel configuration on a long (8-foot) box. New features, such as 170-degree-opening rear access doors with fully retractable power windows on extended cab models, offer increased versatility.

The pickup boxes have been redesigned with enhanced versatility, increased strength and greater capacity. A one-piece wheelhouse and inner box side add strength and a smoother, more integrated appearance. The boxes are 1.18 inches (30 mm) deeper in the front and 1.57 inches (40 mm) deeper at the rear, with stronger inner walls that offer improved performance when fitted with ladder racks, tool boxes and other accessories. Cargo bed volume is 60.7 cubic feet (1,718 L) with the regular 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).






Edited 2 time(s). Last edited Thursday, December 07, 2006 10:27 AM


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Powertrain in details.
From GM:

CLASS-LEADING GAS AND DIESEL POWER AT THE HEART OF 2007 SILVERADO AND SIERRA HEAVY-DUTY TRUCK CAPABILITIES

-New Gen IV Vortec 6.0L gasoline V-8 with variable valve timing delivers class-leading 353 hp (233 kW) and 373 lb.-ft. (506 Nm)*
-More powerful Duramax 6.6L turbo-diesel delivers class-leading 365 hp (272 kW) and 660 lb.-ft. of torque (895 Nm) and meets new stringent 2007 emissions regulations
-New, fuel-saving six-speed Hydra-Matic 6L90 transmission with manual range selection and automatic grade braking feature with gas engine
-Renowned Allison 1000 six-speed automatic paired with Duramax diesel engine
-Gas engine models rated at segment-best 18,500 pounds (8,392 kg) gross combined weight rating

The new Chevy Silverado and GMC Sierra 2500HD and 3500HD heavy-duty trucks have class-leading power for any task. A new, more powerful Gen IV Vortec 6.0L gasoline V-8 engine with variable valve timing and a new more powerful version of the Duramax 6.6L turbo-diesel are the engine choices for the trucks. The gas engine is backed by a new, Hydra-Matic 6L90 six-speed automatic transmission, which features grade braking capability. Duramax diesel-powered trucks are backed by the renowned Allison 1000 six-speed automatic transmission.

The standard engine is the new Gen IV Vortec 6.0L gas V-8 (LY6). It is rated at a segment-leading 353 horsepower (233 kW) and 373 lb.-ft. of torque (506 Nm)* – approximately 18 percent more power and torque than the previous engine. Variable valve timing helps improve performance and fuel economy. Paired with the new six-speed automatic transmission, this powertrain combination offers a higher maximum gross combined weight rating (GCWR) – 18,500 pounds (8,392 kg) – and is the segment leader for heavy-duty pickups with a small-block V-8 gas engine.

Available in the heavy-duty trucks is a new Duramax 6.6L V-8 (LLM) engine that delivers an improved performance rating over the already superior power and torque ratings customers experienced with the previous version. It is rated at a segment-leading 365 horsepower (272 kW) and 660 lb.-ft. of torque (895 Nm). Upgrades to the engine and a new diesel particulate filter system provide a 90-percent reduction in particulate matter and a 50-percent reduction in NO x, over current standards, meeting a new federal government mandate.

“The powertrain choices in the new Silverado and Sierra heavy-duty trucks reaffirm GM’s commitment to delivering the most powerful and most capable trucks in the segment,” said Dr. Terry Woychowski, executive director, vehicle systems engineering and chief engineer for full-size trucks. “Technology, including variable valve timing and a new diesel particulate filter system, enable our powertrains to achieve segment-leading power ratings while at the same time increase efficiency and lower emissions.”

Vortec 6.0L V-8 details

The Silverado and Sierra heavy-duty trucks’ Vortec 6.0L gas V-8 is based on GM Powertrain’s Gen IV small-block V-8 engine family. It shares a basic architecture with other small-block engines, including 4.400-inch bore centers; the same design foundation on which the original and legendary small-block V-8 was developed in the early 1950s.

The 6.0L engine produces a best-in-class 353 horsepower (233 kW) at 4,400 rpm and 373 lb.-ft. of torque (506 Nm)* at 4,400 rpm on 2500HD and 3500 HD single rear wheel models, with peak torque developed early and maintained over a broad rpm range. This provides confidence and ease of operation with a full load or trailer, particularly on steep grades. Additional engine highlights include:

-Deep-skirt iron cylinder block with cross-bolted main caps
-High-flow aluminum cylinder heads
-Electronic throttle control
-58X ignition system
-E38 32-bit controller
-Polymer-coated pistons with full-floating wrist pins
-Returnless fuel system
-Lightweight valvetrain
-Steel camshaft
-Low-restriction air intake system
-Regulated voltage control

The Gen IV V-8 is engineered to meet stringent emissions standards. In fact, compared to truck engines of a decade ago, the Gen IV engine family is approximately 90 percent cleaner. Cast iron exhaust manifolds matched with dual close-coupled catalytic converters help reduce cold-start emissions, which is the largest source of vehicle emissions.

Variable valve timing

Variable valve timing (VVT) is a standard feature on the heavy-duty truck’s 6.0L engine. It helps optimize camshaft timing to improve low-rpm torque and high-rpm horsepower. GM’s introduction of variable valve timing through the unique dual-equal cam phaser was the industry’s first application of VVT on a mass-produced V-8 cam-in-block engine. The unique dual-equal phaser adjusts the camshaft timing at the same rate for both the intake and exhaust valves.

The system incorporates a vane-type camshaft phaser that changes the angular orientation of the camshaft, thereby adjusting the timing of the intake and exhaust valves to optimize performance and economy, and help lower emissions. It offers continuously variable valve timing in relation to the crankshaft. The cam phaser vane is attached to the camshaft on the front journal. As driving conditions warrant, the cam phaser system can reduce ignition timing at higher rpm levels to increase power. At lower rpm levels, torque is enhanced with increased timing.

Precise camshaft timing is the key to the variable valve timing system’s capability to optimize performance. Cam phasing is directed by the engine’s E38 ECM. It relies on data from a camshaft position sensor – a target ring with four equally spaced segments – that communicates the camshaft’s position quicker and more accurately than previous systems that used just a single segment. Also, a spring-loaded tensioner is used on the timing chain to ensure precise tension.

Quiet, durable operation

Like all Gen IV small-block V-8 engines, the heavy-duty trucks’ 6.0L is designed for quiet operation, including:

-Special friction-reducing polymer coating on piston skirts
-Full floating piston pins
-Damping patch on the oil pan (externally mounted)
-Timing chain tensioner
-Quieter alternator

The quiet features of the engine are complemented in the vehicles with strong engine cradles and mounting systems. These systems help reduce vibrations transmitted through the chassis that would otherwise be felt by vehicle passengers.

Backing the new engine’s quietness is the assurance of long-lasting performance. The Gen IV engine family was validated under extreme conditions, with the heavy-duty trucks’ 6.0L engine dynamometer-tested to the equivalent of 200,000 miles – 50,000 miles more than other engines in the family. The engines also feature many long-life engine components that can reduce maintenance intervals and costs. The iridium-tip spark plugs, engine coolant, accessory drive belt and sealing gaskets are some of these items.

Some of the stringent durability testing included cycling engines between the peak torque and peak horsepower rpm points – the equivalent of towing a heavy trailer up a steep grade – for 600 straight hours.

Enhanced 6.6L Duramax diesel

GM Powertrain’s powerful Duramax 6.6L V-8 turbo-diesel engine is revised to meet new, stringent 2007 federal emissions regulations, while delivering increased horsepower and torque. It is rated at a segment-leading 365 horsepower (272 kW) and 660 lb.-ft. of torque (895 Nm).

Upgrades to the engine and a new diesel particulate filter system, along with the use of new, ultra-low sulfur diesel fuel, help the Duramax achieve a 90-percent reduction in particulate matter and 50-percent reduction in NO x, as required by the new emissions standard. All diesel engines manufactured beginning in January 2007 are required to meet the new emissions standard.

“Maintaining power and torque leadership with the Duramax is important because it’s the benchmark that built its class-leading reputation with our customers,” said Charlie Freese, executive director, GM Powertrain Diesel Engineering.

Revised for 2007, the Duramax diesel uses a variable-geometry turbocharger to optimize boost performance over a wide range of operating conditions. This provides the customer with seamless and immediate response, while simultaneously helping to reduce emissions. The turbo, which spins up to 120,000 rpm, is high-speed-balanced for minimal noise and vibration, while contributing to the engine’s overall smoothness and refinement. Maximum boost is 20 psi. Additional details of the Duramax 6.6L V-8 engine’s ’07 enhancements include:

-Cylinder block material strength enhancement provides increased reliability and durability
-Revised piston design with low 16.4:1 compression ratio
-Cylinder heads revised to accommodate higher peak cylinder firing pressure
-Fuel delivered via larger fuel lines and a new, six-hole injector nozzle
-Improved glow plugs heat up faster through an independent controller
-Revised variable-geometry turbocharger is aerodynamically more efficient to help deliver smooth and immediate response and lower emissions
-Intake throttle control is added to enhance combustion and DPF control, as well as provide improved engine smoothness
-EGR has larger and more efficient cooler to provide for cooler exhaust gases going into the system
-32-bit E35 controller, which adjusts and compensates all engine control parameters to bolster efficiency and reduce emissions

The engine also features a rigid cast iron cylinder block with induction-hardened cylinder bores; four-bolt, cross-drilled main bearing caps; forged steel, nitride-hardened crankshaft; aluminum pistons with jet-spray oil cooling; aluminum cylinder heads with four valves per cylinder; water-cooled turbocharger; integrated oil cooler and a charge-cooled turbocharging system.

Meeting the new emissions standard

To meet the new 2007 emissions regulation, the Duramax 6.6L V-8 engine features:

-An enhanced combustion system, including an improved injector design for the high-pressure fuel system
-Additional combustion control through an even more efficient variable-geometry turbocharging system and increased Exhaust Gas Recirculation (EGR) cooling reduce NO x
-Addition of a new Diesel Particulate Filter (DPF) to reduce soot and particulate matter
-Increased-capacity cooling system
-New engine control software
-Use of low-ash engine oil
-Use of ultra low sulfur diesel fuel, which becomes the common service pump-available fuel

The 6.6L engine’s DPF is based on GM-patented technology and proven supplier components. It traps diesel particulate matter in a honeycomb-like ceramic “brick” after it travels through an oxidizing catalyst. The exhaust gases are then routed out through the exhaust system. An automatic regeneration process periodically uses exhaust heat to remove the soot from the DPF.

An onboard computer controls fuel injection and oxygen content to adjust the exhaust energy to the appropriate level to clean the particulate trap. The DPF and corresponding components will change the exhaust system length and/or outlet design, depending on the vehicle model. Also, an expanded underbody heat shield is added.

New Hydra-Matic 6L90 six-speed RWD transmission

Supporting the high-performance capabilities of the 6.0L gas engine is the new Hydra-Matic 6L90 six-speed automatic transmission. It has a wide, 6.04:1 overall ratio – including two overdrive gears – that helps deliver an excellent balance of performance and fuel economy.

The 6L90 has a steep, 4.02:1 first gear, which provides a very strong launch feel, and shorter “steps” between all gears, allowing the transmission to quickly find the best gear and reducing hunting on grades – a trait that is especially helpful when towing. The two overdrive gears include a 0.85:1 ratio in fifth gear and a 0.66:1 ratio in sixth. With two overdrive gears, engine rpm is reduced by approximately 19 percent at 60 mph. Lower engine rpm can bolster fuel economy because less fuel is used. A lower-rpm cruising speed also enhances smoothness and reduces noise heard in the vehicle’s cabin.

Gear changes from second to sixth gears are accomplished with clutch-to-clutch control that allows a greater degree of smoothness at lower vehicle speeds. The clutch-to-clutch operation is achieved with three planetary gears, three stationary clutches and two rotating clutches. It is a simple, less complex design that enables the six-speed transmission to be packaged in a size not much larger than a four-speed automatic. All forward gear shifts feature clutch-to-clutch operation.

A new, 32-bit electro-hydraulic control module monitors the transmission to ensure consistent performance. The 6L90 has the capability for adaptive shift controls and other features such as grade braking, and Driver Shift Control with tap up/tap down shifting, which allows the driver to manually select upshifts and downshifts with a button on the column shifter. Tow/haul mode is a driver-selectable feature that reduces shift busyness when towing or hauling a heavy load. Auto grade braking is available when the tow/haul mode is selected and the transmission is not in the range selection mode.

Allison six-speed automatic details

The Allison 1000 six-speed automatic transmission is partnered with the Duramax 6.6L turbo-diesel engine. It is a strong, durable and proven transmission that matches the prodigious torque output of the Duramax diesel engine. This six-speed transmission also 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.

The transmission’s sixth gear – essentially a second overdrive gear – enables a wide, 5.08:1 overall forward gear ratio and allows the vehicle’s engine to operate at lower rpm, particularly during higher-speed driving on highways and freeways. Its 0.61 ratio provides a 1,550-rpm engine speed at 60 mph, compared with the five-speed transmission’s 1,800-rpm engine speed at 60 mph. The engine uses less fuel at lower rpm, enabling increased fuel mileage and range.

The range selection feature complements the tow/haul mode and allows the driver to select the desired gears, via a thumb-activated switch on the shifter, providing a feeling of enhanced control in unique driving situations, such as towing on a steep grade. The range selection feature holds the gear pre-selected by the driver, and electronic safeguards prevent the transmission from being shifted in a manner that could cause engine damage or loss of vehicle control. Grade braking and cruise grade braking are available when the tow/haul mode is selected and the transmission is not in the range selection mode.

A low-traction mode also is a feature of the Allison transmission. When the driver selects second gear while stopped and wheel slip occurs, the transmission torque-manages the engine to limit tire slip on slippery road surfaces. The Allison 1000 also has a unique, GM-patented elevated idle mode, which allows for faster interior warm-up. The system, which is activated through the vehicle’s driver information center, is synchronized with the engine. When elevated idle is active, the transmission increases the load on the engine so that it will generate heat more quickly and warm the interior in less time.







Edited 1 time(s). Last edited Thursday, December 07, 2006 10:29 AM


>>>For Sale? Clicky!<<<
-----The orginal Mr.Goodwrench on the JBO since 11/99-----

first time in a LOOOOOOOONG time the GMC is uglier than the chevy


lol

Those wheels/tires look awfully tiny compared to the rest of the truck.

RoNuS20 wrote:Those wheels/tires look awfully tiny compared to the rest of the truck.

Usually the HD versions of most trucks come with tiny wheels.

Not really sure why, but it's something that is noticed.

And to be honest, I liked the previous generation ALOT better.

Drool......


I do love the old version but the HDs look hot with that style headlight and body.



And honestly, the GMC has always been uglier than the chevy.

ugly

very ugly

thats why i bought a titan


*************Yea i spell liek wrong get over it*****************
** If i write in caps its cause im @ work and i can only write in caps cause the keyboard is a retarded CAPS only keyboard.**

Snowman wrote:very ugly

thats why i bought a titan

Speaking of ugly...

No more 8.1 big block?

O noes!

im actually really diggin' the GMC


<~~~~PWN3D!!

i dunno the headlights are way to boxy an the chevy version that chrome bumper corner is huge lol

Smokey wrote:No more 8.1 big block?

As of now, no.
Since GM did a "shotgun play" to the market with the GMT-900s. GM is having a tough time meeting supply material for their engines, as they are switching over to all aluminum, instead of Iron head / aluminum block.
Expect a higher displacement engine when they meet demand in the middle of next year.





>>>For Sale? Clicky!<<<
-----The orginal Mr.Goodwrench on the JBO since 11/99-----

they look bloated.
ugly




MIAMI HEAT
NBA CHAMPS!!!

very cool....trucks aren't for looks, they're for function...and I see a lot of good ideas in there...looks do matter, and they usually grow on me...we'll see

a few months ago we had a little photoshop thread on these trucks. so incase anyone is wanting to know what they look like slammed, here it is...

^^^ a few months ago on gmfullsize.com, not here. just incase there was any confusion.

Wow you guys are really ripping apart. lol

I think it looks better then this overdone POS.





Besides
Duramax's reliability > Power Stroke's reliability



>>>For Sale? Clicky!<<<
-----The orginal Mr.Goodwrench on the JBO since 11/99-----

Mr.Goodwrench-G.T. wrote:Wow you guys are really ripping apart. lol

I think it looks better then this overdone POS.





Besides
Duramax's reliability > Power Stroke's reliability

sigh
as much as id like to argue that
i cant

and its finally nice to see a GM vehicle with more wheelgap than a cavalier
ha

themarin8r wrote:and its finally nice to see a GM vehicle with more wheelgap than a cavalier
ha

not by much, but you're right




I work on Wall Street, but didn't force you to take out a loan you couldn't afford.

thats really handy...for hauling.....um cows or something



1989 Turbo Trans Am #82, 2007 Cobalt SS G85

I used to love how the HD Chevy' s looked. Now I think it is just awefull. I hoped it would grow on me, but the more I look at it the more I hate it. The GMC at least looks good from the front.

But, I'm sure they are still good work trucks, and that's all that really matters here.
My dad has a 1991 Sierra 2500, and I can't beleive how perfect that truck has run, over 300 000 Kms on a beaten up work truck and the only major thing to be replaced was the starter.

Mr.Goodwrench-G.T. wrote:Duramax's reliability > Power Stroke's reliability

Cummins > all