GMC today announces the new 2011 Sierra Denali HD, the first

offering of the exclusive Denali line on a heavy-duty GMC pickup. The

Sierra Denali HD leads a comprehensively redesigned lineup of 2011

Sierra 2500HD and 3500HD trucks that go on sale in early summer –

including the most powerful diesel engine in the segment.

Sierra HD’s new 6.6L Duramax turbo diesel delivers 397 horsepower

(296 kW) at 3,000 rpm and 765 lb.-ft. of torque (1,037 Nm) at 1,600

rpm.

“The new Sierra Denali HD is the latest expression of GMC’s Denali

philosophy of blending capability with premium features and styling,”

said Lisa Hutchinson, GMC product marketing director. “It is a premium

tool that offers many comfort and infotainment features, along with a

maximum towing capacity of 15,600 pounds with the segment’s most

powerful diesel – that’s enough to tow a 34-foot-long, three-axle

travel trailer.”

The Sierra Denali HD comes exclusively on the 2500HD chassis, in a

4WD crew cab standard box configuration. A Vortec 6.0L gas

V-8/six-speed automatic powertrain is standard and the new Duramax 6.6L

turbo diesel/Allison 1000 six-speed transmission powertrain is

available.

The iconic Denali four-bar, chrome grille with round air inlets

distinguishes the Sierra Denali HD on the outside, along with

body-color bumpers, chrome door handles, chrome accents and 18- and

20-inch polished forged aluminum wheels.

The balance of the new 2011 Sierra HD lineup is identified on the

outside by new, three-bar grilles and powertrain-badged louvered hoods,

along with a revised, full-width chrome steel front bumper and a new

family of 17-, 18- and 20-inch wheels. It’s beneath the skin, however,

where they are truly separated from their predecessors – and the

competition. Highlights include:

• Increased towing capability (20,000 lbs./9,072kg) and payload (6,335 lbs./2,873 kg) supported by all-new fully-boxed,

  high-strength-steel frames and strong suspensions for maximum

  capability and exceptional ride characteristics

• Five of the 12 3500HD models offer a payload capability greater than

  6,000 pounds vs. Ford Super Duty’s single model greater than 6,000

  pounds

• Thirteen of the 22 2500HD models offer apayload capability greater than 3,100 pounds vs. Ford Super Duty’s

  single model greater than 3,100 pounds

• New 6.6LDuramax diesel delivers segment-best power, up to 11-percent greater

  highway fuel economy, up to 63-percent lower emissions, B20 biodiesel

  capability and quicker acceleration

• Larger gastank and fuel economy improvements allow up to 680 miles (1,090 km)

  between fill-ups with the 6.6L Duramax turbo diesel

• All-new “smart” exhaust brake feature provides greater control on grades and reduced brake pad wear
• An array of control features, including trailer sway control,

  integrated trailer brake control, hill start assist, automatic grade

  braking, intelligent brake assist and larger brakes

• Purposeful technology, including available mobile WiFi, USB

  connectivity, Bluetooth connectivity, XM Satellite Radio, OnStar 9.0

  and navigation.

“GMC has been one of the industry’s strongest truck brands for more

than 100 years, and we back the 2011 Sierra HDs with a comprehensive

five-year/100,000-mile powertrain warranty that provides the best

coverage in America,” said Hutchinson. “From the segment-best diesel

power to the segment-best warranty, these trucks deliver strength and

peace of mind on all fronts.”

Following are details of the new and redesigned product features of

the Sierra Denali HD and the other Sierra 2500HD and 3500HD models.

The Sierra HD lineup brings greater capability.

The details: Depending on the model, Sierra HD models offer:

• Increased fifth-wheel towing capacity of 20,000 pounds (9,072 kg)
• Conventional towing capacity increases up to 23 percent, with a maximum of 16,000 pounds (7,272 kg)
• Improved payload capability of 6,335 pounds (2,873 kg) on a complete vehicle
• Gross Combined Weight Rating increases to 27,500 pounds (12,500 kg)
• Gross Vehicle Weight Ratings increases up to 17 percent to 13,000 pounds (5,909 kg)
• Front Axle Weight Rating increases by up to 25 percent to 6,000 pounds (2,721 kg)
• Snow plow capability for all 4WD cab configurations.

“You can see by the ratings numbers that the Sierra HD lineup is

more capable, but the trucks are also better performers in the

intangible qualities that bond owners with their trucks,” said Rick

Spina, vehicle line executive. “They accelerate quicker – especially

when fully loaded – stop more confidently and deliver a smooth, quiet

driving experience that you have to experience to fully appreciate.”

The new 2011 Sierra Denali pairs capability with premium features.

The details: The new Sierra Denali HD is offered

exclusively in the Crew Cab standard box configuration on the 2500HD

chassis, providing a spacious cabin with room for up to five. As with

other Denali models, including the new Acadia Denali, the cabin is

unique with standard premium touches. It includes Denali-specific

brushed aluminum trim, power-adjustable pedals, a Bose premium surround

audio system and 12-way power seats. Along with an optional heated

steering wheel, heated and cooled leather-appointed seating is

available. The exterior is offered in three colors: Black, Stealth Gray

and White.

On the capability front, the Sierra Denali has a gross vehicle

weight rating (GVWR) of 10,000 pounds (4,536 kg), a payload capacity of

2,959 pounds (1,342 kg) and a maximum trailering rating of 15,600

pounds (7,076 kg) with a fifth-wheel hitch. The maximum conventional

hitch trailering rating is 13,000 pounds (5,897 kg).

Engineers developed 11 all-new, fully boxed frame assemblies to

improve durability and ride characteristics and support increased

capabilities.

The details: The frames have increased cross sections and

use more high-strength steel for greater durability, higher towing

capacity and improved ride and handling; the front sections are

hydroformed. The bending and beaming stiffness of the frames is

increased 92 percent and 20 percent, respectively, with the fully boxed

sections enhancing torsional stiffness by a factor of five. Also,

larger engine and transmission mounts, coupled with a

125-percent-stiffer front frame structure, provide greater vibration

control, while hydraulic body mounts are incorporated under the cab

section on extended and crew cab models for a more isolated feel

inside. Engineers addressed common customer and aftermarket uses when

designing the new frames, including adding access holes to the rear

frame section to enable easier installation of

fifth-wheel/gooseneck-style hitches. Also, the frame-mounted hitch for

conventional trailering is stronger, with a box-tube design. It

supports up to 16,000 pounds (7,257 kg).

Sierra HDs feature a new, stronger independent front suspension – enabling snow plow installation on all 4WD models.

The details: A completely redesigned independent front

suspension system offers up to a 25-percent greater front axle weight

rating – up to 6,000 pounds (2,721 kg) front gross axle weight rating

(FGAWR) – so a snow plow can be used on all 4WD cab configurations with

the available snow plow prep package. Sierra’s signature short-long

arm/torsion bar front suspension design is retained, but now features

new, forged steel upper control arms that are stronger and lighter than

their predecessors. The new lower control arms are made of

precision-machined cast iron to handle the greater loads. Five

different torsion bar rates support five different front gross axle

weight ratings (a single torsion bar was previously used for all

models). This helps stabilize the range of trim heights of various

models under load, while enhancing appearance, handling, durability,

tire wear and alignment. The trim height is adjusted on each bar via a

single bolt, easily allowing the height to be changed to account for

the weight of a snow plow or other accessories. The Sierra HD front

suspension now uses a pair of urethane jounce bumpers on each side,

instead of one, for improved load management; and there’s a new upper

shock mount attachment design that’s positively connected to the frame

with two fasteners. This design eliminates squeaks and clunks, while

supporting higher load capability and increased durability.

COMPETITIVE FACTS: Compared to competitors’ beam-axle front

suspensions, the Sierra’s independent front suspension provides a

better ride, more accurate trim height control (with fewer parts) and

greater flexibility to adjust the alignment for weight and tire

sensitivity.

A new asymmetrical leaf-spring rear suspension supports greater loads.

The details: Matching the Sierra HD’s greater strength and

capability is a rear suspension designed to support greater loads. It

features a new, larger asymmetrical leaf-spring design that also

contributes to improved ride and handling characteristics. The

asymmetrical design is derived from unequal front and rear spring half

lengths, which minimize axle hop and enhance traction control

efficiency. 2500HD models feature a two-stage leaf-spring design, while

3500HD models have a three-stage design. All models feature 3-inch-wide

(76 mm) leaf springs that are 20-percent wider than previous models.

The larger leaf-spring design supports increased rear gross axle weight

ratings across the board. On the 2500HD models, the rating is 6,200

pounds (2,818 kg) – up from 6,084 (2,765). On 3500HD models, the rating

increases to 7,050 pounds (3,204 kg) on single-rear-wheel models and

9,375 pounds (4,261 kg) on dual-rear-wheel models – the latter

representing a nearly 14-percent increase over the previous 8,200-pound

(3,727 kg) rating.

Sierra HDs deliver a more refined driving experience, with more capable ride, handling and steering.

The details: Longer wheelbases – ranging from 133.6 inches

(3,395 mm) to 167.7 inches (4,259 mm) – and wider front/rear tracks

enhance the ride and handling characteristics of the Sierra 2500HD and

3500HD, giving them a greater feeling of smoothness and control. The

longer wheelbases and wider tracks are complemented by the new, stiffer

frames, new jounce bumpers, shock mounts and hydraulic body mounts to

provide a solid, smooth and isolated driving experience. New shocks

were specially valved to support the new trucks’ weight ratings, while

balancing excellent ride characteristics. Also enhancing the driving

experience is a revised steering system designed to support the trucks’

greater front gross axle weight rating. It includes a new, larger

steering gear, power steering pumps and linkages. The pumps (different

parts for gas and diesel models) deliver greater pressure for reduced

steering effort in low-speed and parking maneuvers; they are also

quieter. On some models, the new linkages feature a compliant joint

added at the pitman attachment to enhance handling.

The new 6.6L Duramax turbo diesel delivers segment-leading

torque and up to 63-percent lower NOx emissions; and is B20-capable.

The details: The workhorse Duramax 6.6L turbo diesel V-8 is

more powerful and durable for 2011, delivering segment-best horsepower

and torque – 397 horsepower (296 kW) at 3,000 rpm and 765 lb.-ft. of

torque (1,037 Nm) at 1,600 rpm – lower emissions and B20 biodiesel

capability that promotes a domestically produced renewable fuel. The

new Duramax 6.6L features:

• NOx emissions reduced at least 63 percent over 2010 models
• Quieter operation
• High-pressure (30,000 psi/2,000 bar) Piezo-actuated fuel system for

  greater fuel efficiency, improved performance and reduced emissions

• “Smart” exhaust brake feature that enables controlled vehicle slowdown on downhill grades without actuating the brakes
• Selective catalytic reduction after-treatment system using diesel

  exhaust fluid (DEF) 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 andafter-treatment have been optimized to provide about 700 miles (1,125

  km) between diesel particulate filter regenerations – a 75-percent

  improvement over the previous system and a significant contributor to

  improved fuel efficiency, as the regeneration process requires

  additional fuel

• B20 biodiesel capability for an alternative fueling option
• Internal revisions that improve durability.

With nearly 1.3 million Duramax 6.6L engines produced since 2000,

they have proven exceptionally durable and dependable. The internal

elements that helped build its reputation are enhanced for 2011,

including:

• Main bearings’ profiles changed to enhance oil film thickness
• Oil pump flow increased for increased pressure at low speeds
• Modified turbocharger oil circuit for increased pressure at the turbo and faster oil delivery
• The connecting rods’ pin ends are modified to provide increased piston support
• New, higher-strength piston design that eliminates bushings to provide lower reciprocating weight
• An EGR cooler bypass reduces high-mileage soot deposits in the cooler and EGR circuit.

COMPETITIVE FACTS: Compared with Ford Super Duty’s

urea-based system, Sierra HD’s selective catalytic reduction

after-treatment system delivers better overall diesel performance, with

a range of about 5,000 miles (8,000 km) between DEF refills. Its

optimized combustion and after-treatment process provides about 700

miles (1,125 km) between diesel particulate filter regenerations – a

better capability than Ford’s.

New Allison 1000 six-speed automatic transmission works with the

Duramax 6.6L to deliver greater fuel economy, quicker acceleration,

greater towing capability and exhaust brake system.

The details: The enhanced Allison 1000 is strengthened to

handle the higher torque capability of the new 6.6L Duramax engine,

while also helping to improve fuel economy and provide seamless

assistance with a new exhaust brake system. Greater efficiency is

delivered through reduced “spin loss” – meaning, the transmission

channels more of the engine’s power to the axles, allowing it to do

more with less fuel. The Allison 1000 also 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.

The six-speed configuration retains its two overdrive gears for optimal

efficiency. Performance with the Duramax/Allison combination is also

improved over previous models, with preliminary testing showing 0-60

mph times of less than 9 seconds and quarter-mile times of less than 16

seconds in 2500HD models. That’s about 0.3-second and 0.5-second

quicker, respectively, than previous models.

A strengthened Vortec 6.0L/Hydra-Matic 6L90 six-speed powertrain is standard in all models.

The details: The Vortec 6.0L gas V-8 with variable valve

timing returns to the new Sierra HDs, along with a strengthened version

of the Hydra-Matic 6L90 six-speed automatic transmission. This

combination delivers excellent performance and efficiency, with a

greater emphasis on low-rpm power. It is enhanced for 2011 with greater

idle refinement.

The engine is rated at 360 horsepower (268 kW) at 5,400 rpm and 380

lb.-ft. (515 Nm) at 4,200 rpm in trucks with GVWRs up to 10,000 pounds.

It is rated at an estimated 322 horsepower (240 kW) at 4,400 rpm and

380 lb.-ft. of torque (515 Nm) at 4,200 rpm in trucks with GVWRs

greater than 10,000 pounds.

The 6L90 is enhanced for greater strength, smoothness and quietness via:

• Adding four attachment bosses to the transfercase adapter (4WD models) for increased strength and smoother, quieter

  performance

• Increasing the cross section size of the transfer case adapter for greater strength
• Adding a new, stronger output shaft
• Adding a new heat shield and vent hose.

COMPETITIVE FACTS: Ford’s new Super Duty models share the

same transmission between their gas and diesel engines. Sierra HDs’

Allison 1000 and Hydra-Matic 6L90 transmission were developed for the

specific horsepower, torque and operating range differences that

distinguish the diesel and gas engines.

Brake feel and performance is greatly improved.

The details: The standard four-wheel disc system is

completely revamped to deliver smoother, more immediate and

confident-feeling performance. Four-wheel, four-channel ABS is standard

on all single-rear-wheel models and a three-channel system is standard

on dual-rear-wheel models. The front and rear rotors are larger in

diameter – 14 inches (355 mm) – and width on all models to support

their increased capacity, weight ratings and trailering ratings, while

the calipers are stiffer and stronger. The hydroboost brake booster

calibration is revised for reduced pedal effort, and the travel of the

pedal is also revised for a more comfortable, confident feel. Larger

wheel hub and bearing assemblies complement the new brake system, and

the rear rotors attach to the wheel hubs for easier servicing.

Sierra HD’s ‘smart’ exhaust brake feature provides greater control and reduces brake pad wear.

The details: A new standard feature on Duramax-equipped

models is the “smart” exhaust brake. This driver-selectable feature

uses the turbine control of the variable geometry turbocharger and the

compression of the engine to generate backpressure, slowing the vehicle

without applying the brakes. It is integrated with the cruise control

feature and varies the braking to account for the grade and vehicle

load. The exhaust brake allows for virtually effortless driving and

towing, with seamless and quiet operation. It also helps prolong brake

life and prevents overheating the brakes on long, downhill grades.

Comprehensive safety features and functional technologies include trailer sway control system and hill start assist.

The details: The 2011 Sierra 2500HD and 3500HD models have

a comprehensive roster of safety features and functional technologies

that include:

• StabiliTrak electronic stability control system on all single-rear-wheel models
• Larger, four-wheel disc brakes with standard four-wheel ABS
• A new high-strength steel tubular frame cross member that enhances safety and improves crashworthiness
• Seat pelvic/thorax and head curtain side air bags available on 2500HD
• Available rear backup camera
• Segment-exclusive OnStar 9.0
• Trailer sway control system on all single-rear-wheel models
• Hill start assist (standard on single-rear-wheel models)

The trailer sway control system provides an added measure of

confidence when towing a trailer. The system senses conditions of

trailer sway and intervenes with braking and/or reduced engine power to

bring the trailer under control and keep it on its intended path. The

system uses electric trailer brakes when a trailer is plugged into the

standard wiring harness of the truck and its performance requires no

input from the driver. The hill start assist system is automatically

engaged when sensors detect the vehicle is on a grade of about 5

percent or greater. It holds the brakes for about 1.5 seconds or until

the gas pedal is pressed, preventing rollback – it is particularly

effective when towing, giving the driver time to switch from the brake

pedal to the gas pedal without rolling.

The GMC Sierra HD lineup is broader than ever.

The details: For 2011, the Sierra heavy-duty lineup expands

to include 11 2500HD models and eight single- and dual-rear-wheel

3500HD models – including a new 3500HD Crew Cab with a 6.5-foot cargo

box. Other models are offered in WT, SLE and SLT trim levels, while

popular features such as the EZ Lift tailgate and rearview camera

system are retained.

Sierra HD professional-grade interiors are refined and well-appointed – and ready to work.

The details: From the available remote starting feature to

the unimpeded access offered by the 170-degree-opening rear access

doors on extended cab models, the 2011 Sierra HD models reflect the

professional grade blend of refinement and functionality for which GMC

is known. The interiors have excellent attention to detail and are

quieter – thanks to the range of the truck’s enhancements. The stronger

chassis, quieter Duramax engine and even details like a quieter power

steering pump contribute to the Sierra HD delivering exceptional

quietness.

Along with quietness, Sierra HD models are designed for work. The

interiors feature numerous storage compartments, providing covered

access for everything from work gloves to laptops. For those who use

their truck as a mobile office, Sierra HDs deliver with available

mobile WiFi, USB connectivity, Bluetooth connectivity, XM Satellite

Radio and a navigation system. Multiple charge points enable multiple

electronic devices to operate simultaneously; and when equipped with

the available navigation system, XM NavTraffic offers real-time updates

of traffic conditions (in selected areas) that can help plan the most

effective route to the job site.

Sierra HDs are ready for the long haul – and the cold.

The details: The 2011 Sierra HDs drive farther without

stopping to refuel. A new, 36-gallon (136 L) fuel tank is standard on

all models and, with the improved fuel efficiency of the powertrains,

enables a cruising range of about 680 miles (1,090 km) with the Duramax

6.6L. Cold-weather customers will appreciate the Duramax 6.6L’s quick,

reliable start-up, with a starting time on par with gas engines. Its

glow plug cycle time is the segment’s best in all temperatures, taking

no more than 3 seconds in temperatures as low as -20 F (-29 C). There’s

also a cab heat-up feature that allows the engine to idle faster in low

temperatures to warm the interior more quickly.

The 2011 Sierra HD lineup has the best warranty coverage in America.

The details: All 2011 Sierra 2500HD and 3500HD trucks work

under the best warranty coverage in America: a five-year/100,000-mile

limited powertrain warranty, plus roadside assistance, courtesy

transportation and other features that provide assurance that GMC backs

its trucks for everything the road offers.

About GMC

GMC is evolving to include more fuel-efficient trucks and

crossovers. The GMC Terrain is a smaller SUV that offers 32 mpg highway

fuel economy along with the capability, engineering expertise and

refinement that have defined GMC for more than a century. Complementing

the Terrain are the Acadia eight-passenger crossover, Yukon and Yukon

XL and Sierra pickups. Today GMC is the only manufacturer offering

three full-size hybrid models. Details on all GMC models are available

at www.gmc.com.

# # #

SPECIFICATIONS
2011 SIERRA DENALI HD

Overview

Models:	2500HD Denali crew cab std. box, 4WD
Body style/driveline:	5-passenger crew cab; 3/4-ton; 4-wheel-drive heavy-duty pickup
Construction:	body on frame
EPA vehicle class:	full-size truck
Manufacturing location:	Flint, Mich.
Key competitors:	Ford Super Duty Series pickup, Ram heavy-duty pickup

Engines

	Vortec 6.0L V-8 (L96)	Duramax 6.6L Turbo Diesel V-8 (LML)
Type :	6.0L V-8	6.6L V-8
Displacement (cu in/cc):	364/5967	403/6599
Bore & stroke (in/mm):	4.00 x 3.62/101.6 x 92	4.06 x 3.9/103 x 99
Block material:	cast iron	cast iron
Cylinder head material:	cast aluminum	cast aluminum
Valvetrain:	overhead valve, two valves per cylinder, variable valve timing	overhead valve, four valves per cylinder
Ignition system:	coil-near-plug, platinum- tipped spark plugs, low-resistance spark plug wires	compression, glow plug start aid
Fuel delivery:	sequential fuel injection	direct injection diesel with high-pressure common rail
Compression ratio:	9.6:1	16.0:1
Horsepower (hp/kW @ rpm):	360/268 @ 5400	397/296 @ 3000
Torque (lb-ft/Nm @ rpm) :	380/515 @ 4200	765/1037 @ 1600
Recommended fuel:	regular unleaded	diesel or B20
Maximum engine speed (rpm):	6000	4800
Emissions controls:	three-way catalytic converter, positive crankcase ventilation, evaporative collection system	cooled exhaust gas recirculation (EGR), EGR cooling-bypass system, diesel particulate filter system (DPF), selective catalyst reduction (SCR)

Transmissions

	Hydra-Matic 6L90	Allison 1000
Type :	six-speed automatic (with Vortec 6.0L)	six-speed automatic (with Duramax 6.6L)
Gear ratios (:1):
First:	4.03	3.10
Second:	2.36	1.81
Third:	1.53	1.41
Fourth:	1.15	1.00
Fifth:	0.85	0.71
Sixth:	0.67	0.61
Reverse:	3.06	4.49
Final drive ratio:	3.73 or 4.10	3.73

Chassis/Suspension

Front:	all models: std long- and short-arm independent front torsion bar suspension
Rear:	semi-elliptic two-stage multi-leaf spring
Steering type:	integral power-assisted recirculating ball
Steering ratio:	16.1
Steering wheel turns, lock-to-lock:	3.57

Turning Circle

Brakes

Wheels/Tires

Dimensions

Exterior

Wheelbase (in/mm):	153.7/3904.4
Overall length (in/mm):	240.1/6100
Overall width (in/mm):	80/2032
Overall height: (in/mm):	78.3/1989.5
Track – front (in/mm):	68.8/1748
Track – rear (in/mm):	67.3/1709
Min. ground clearance (in/mm):	front: 9.7/247 rear: 8.2/209
Step-in height (in/mm):	26/661

Weight and payload ratings

	GVWR (lb/kg)	Curb Weight (lb/kg)	Payload (lb/kg)
Crew cab, std. box (4WD):	6.0L: 9500/4173 6.6L: 10000/4173	6.0L: 6377/2892 6.6L: 7208/3269	6.0L: 2959/1342 6.6L: 2792/1266

Cargo box

Cargo volume (cu ft/L):	60.7/1718
Length at floor (in/mm):	78.8/2003
Width at floor (in/mm):	62.4/1586
Tailgate width (in/mm):	61.5/1564
Width between wheel housings (in/mm):	50.6/1286
Inside height (in/mm):	21/533

Interior

Headroom (in/mm):	front: 41.2/1048
	rear: 40.5/1030
Legroom (in/mm):	front: 41.3/1049
	rear: 39/991
Shoulder room (in/mm):	front: 65.2/1657
	rear: 65.1/1655
Hip room (in/mm):	front: 60.3/1532
	rear: 65.4/1663

Capacities

Seating:	5
Fuel tank (gal/L):	36/136
Engine oil (qt/L):	6.0L: 6.0/5.7 6.6L: 10/9.5
Cooling system (qt/L):	6.0L: 16.4/15.5 6.6L: 25.4/24

Trailering

	Trailer towing maximum with ball hitch (lb/kg)	Trailer towing maximum with fifth-wheel hitch (lb/kg)
Sierra Denali HD:	6.0L (3.73 axle): 9300/4218 6.0L (4.10 axle): 13000/5897 6.6L (3.73 axle): 13000/5897	6.0L (3.73 axle): 9300/4218 6.0L (4.10 axle): 13700/6214 6.6L (3.73 axle): 15600/7076

*SAE certified.

Note: Information shown is current at time of publication.

SPECIFICATIONS

2011 SIERRA 3500HD

Overview

Models:	3500HD reg. cab, long box, 2WD & 4WD
	3500HD ext. cab, long box, 2WD & 4WD
	3500HD crew cab, long box, 2WD & 4WD
	3500HD crew cab, std. box, 2WD & 4WD
Body style/driveline:	2-3 passenger regular cab or 5-6 passenger extended cab,
	5-6-passenger crew cab
	1-ton; 2- and 4-wheel-drive heavy-duty pickup
Construction:	body on frame
EPA vehicle class:	full-size truck
Manufacturing location:	Flint, Mich., Ft. Wayne, Ind.
Key competitors:	Ford Super Duty Series pickup, Ram heavy-duty pickup

Engines

	Vortec 6.0L V-8 (L96)	Duramax 6.6L Turbo Diesel V-8 (LML)
Type:	6.0L V-8	6.6L V-8
Displacement (cu in/cc):	364/5967	403/6599
Bore & stroke (in/mm):	4.00 x 3.62/101.6 x 92	4.06 x 3.9/103 x 99
Block material:	cast iron	cast iron
Cylinder head material:	cast aluminum	cast aluminum
Valvetrain:	overhead valve, two valves per cylinder, variable valve timing	overhead valve, four valves per cylinder
Ignition system:	coil-near-plug, platinum- tipped spark plugs, low-resistance spark plug wires	compression, glow plug start aid
Fuel delivery:	sequential fuel injection	direct injection diesel with high-pressure common rail
Compression ratio:	9.6:1	16.0:1
Horsepower (hp/kW @ rpm):	360/268 @ 5400 < 10,000 GVWR 322/240 @ 4400 > 10,000 GVWR	397/296 @ 3000
Torque (lb-ft/Nm @ rpm) :	380/515 @ 4200 (all models)	765/1037 @ 1600
Recommended fuel:	regular unleaded	diesel or B20
Maximum engine speed (rpm):	6000	4800
Emissions controls:	three-way catalytic converter, positive crankcase ventilation, evaporative collection system	cooled exhaust gas recirculation (EGR), EGR cooling-bypass system, diesel particulate filter system (DPF), selective catalyst reduction (SCR)

Transmission

	Hydra-Matic 6L90	Allison 1000
Type:	6-speed automatic (with Vortec 6.0L)	6-speed automatic (with Duramax 6.6L)
Gear ratios (:1):
First:	4.03	3.10
Second:	2.36	1.81
Third:	1.53	1.41
Fourth:	1.15	1.00
Fifth:	0.85	0.71
Sixth:	0.67	0.61
Reverse:	3.06	4.49
Final drive ratio:	3.73 or 4.10	3.73

Chassis/Suspension

Front:	all models: std long- and short-arm independent front torsion bar suspension
Rear:	semi-elliptic three-stage multi-leaf spring
Steering type:	integral power-assisted recirculating ball
Steering ratio:	16:1
Steering wheel turns, lock-to-lock:	3.57

Turning Circle

	Regular Cab Long Box	Extended Cab Long Box	Crew Cab Long Box	Crew Cab Std. Box
Turning circle, curb-to-curb (ft/m):	SRW: 44.9/13.7 DRW:45.6/13.9	SRW: 51.8/15.8 DRW: 52.8/16.1	SRW: 54.8/16.7 DRW:55.4/16.9	SRW: 50.5/15.4 DRW: N/A

Brakes

Type:	power-assisted, Hydroboost brake-apply system, four-wheel disc, four-wheel ABS
Rotor diameter x thickness (in/mm):	front: 13.97 x 1.57/355 x 40 rear: 13.97 x 1.57/355 x 40
Total swept area (sq in/sq cm):	front: 278/1793 rear: 278/1793

Wheels/Tires

Wheel size and type
Single rear wheels:	18 x 8.0-in steel 18 x 8.0-in aluminum
Dual rear wheels:	17 x 6.5-in steel
Tire size
Single rear wheels:	LT265/70R18 all season or all terrain
Dual rear wheels:	LT235/80R17 all season or all terrain

Dimensions
Exterior

	Regular Cab Long Box	Extended Cab Long Box	Crew Cab Std. Box	Crew Cab Long Box
Wheelbase (in/mm):	133.6/3395.4	158.1/4017.4	153.7/3904.4	167.7/4259.4