GMC 2014 Sierra HD User manual

2014

MODELS
3Introduction
6Interior
FEATURES & BENEFITS
10 Exterior
12 Interior Convenience
14 Entertainment
16 Drivetrain
18 Chassis
20 Trailering
21 Safety
SELECTION
22 Interior Colors
23 Exterior Colors
24 Accessories
25 Specifications

2014 GMC SIERRA HD.Continuous innovation results from a steadfast refusal to engineer anything
less than Professional Grade vehicles. That’s why the 2014 Sierra Heavy Duty series works hard and smart at
the same time. Rejecting compromise and crafting every detail, it is the strongest, most powerful and most
capable lineup of Sierra HD pickups, ever. Engineered to help you achieve more, haul more and trailer more
thanks to deep reserves of heavy-duty power and torque. And now GMC Pro Grade Protection is standard on every
2014 Sierra HD. Learn more about this enhanced peace of mind on page 15. GMC. We Are Professional Grade.

MODELS | 2
SIERRA 2500HD CREW CAB SLT IN QUICKSILVER METALLIC
shown with available equipment.
Overpower obstacles with a
choice of powertrains, pg. 16.

MODELS
SIERRA 2500HD AND 3500HD:
DOING MORE. WITH MORE.
When there’s tough work to do or serious
recreation to enjoy, GMC Sierra 2500HD and Sierra
3500HD are your trucks. They share intelligence,
versatility and strength—both models offer
the most standard trailering in their class—
distinguished only by their capabilities. Sierra
2500HD provides a maximum 3 /
4-ton fifth-wheel
trailer rating of up to 17,800 lbs1and a maximum
payload of up to 4212 lbs.2Elevate the capability
with Sierra 3500HD in either single- or dual-rear-
wheel configurations and get a max fifth-wheel
trailer rating of up to 23,100 lbs1and a max payload
of up to 7222 lbs.2In either series, you can raise
the standards of Professional Grade to the highest
level of excellence with Sierra Denali.
1Maximum trailer weight ratings are calculated assuming a base vehicle, except for
any option(s) necessary to achieve the rating, plus driver. The weight of other optional
equipment, passengers and cargo will reduce the maximum trailer weight your vehicle
can tow. See your GMC dealer for additional details. 2Maximum payload capacity
includes weight of driver, passengers, optional equipment and cargo.
Put the high-strength, fully boxed
steel HD frame to work, pg. 18.

Increase your braking confidence with
the available diesel exhaust brake, pg. 19.
SIERRA 3500HD CREW CAB SLT WITH DUAL REAR WHEELS
IN QUICKSILVER METALLIC shown with available equipment.
MODELS | 4

MODELS | 5
Enjoy an impressive highway range
with a 36-gallon fuel tank, pg. 19.
Haul more and still enjoy a smooth ride with
multistage rear leaf springs, pg. 18 and pg. 20.

MODELS | 6
Get a warm welcome with a leather-
wrapped, heated steering wheel, pg. 12.
SIERRA 2500 DENALI HD INTERIOR IN EBONY
shown with available equipment.

MODELS | 7
More music to your ears with Bose®
Centerpoint® surround sound system, pg. 14.
Control your environment with
dual-zone climate control, pg. 12.
COMFORT ZONE. Sierra Denali HD is a truck built by—and for—those who demand attention to detail. Its seating
surfaces are trimmed in premium leather that’s perforated for comfort. The front seats are heated, cooled and feature
12-way power adjustment. The gauge cluster integrates a Driver Information Center, putting valuable information in one
place. Every surface says this is no ordinary truck. Every feature contributes to making Denali the ultimate Sierra.

FEATURES & BENEFITS
PROFESSIONAL GRADE:
YOUR USER’S GUIDE.
The following pages offer detailed insights into
the driving, hauling and trailering benefits Sierra
HD pickups provide. Sierra HD trucks don’t simply
happen. They are born of a strict adherence to
engineering excellence. Every component is
the result of never saying never to what’s
possible. And to make sure the strongest,
most powerful and most capable Sierra HD
pickups staythat way, we back them with Pro
Grade Protection (see page 15 to learn more).
SIERRA 2500HD CREW CAB SLT IN ONYX BLACK
shown with available equipment.

Keep you and your trailer heading in the same
direction with Trailer Sway Control, pg. 20.
Make it easier to get in and out of your Sierra
with available accessory assist steps, pg. 24. FEATURES & BENEFITS | 9

SIERRA 2500HD
1SIERRA 2500 DENALI HD Our 3
/
4-ton Sierra
2500 Denali HD sits on a fully boxed, high-strength
steel frame specifically engineered for HD appli-
cations. With the available Duramax Diesel 6.6L V-8
Turbo, it has a trailering capacity of up to 17,400 lbs.1
2PAYLOAD AND TRAILERING Sierra 2500HD has
a maximum payload of up to 4212 lbs,
2and with the
available Duramax Diesel 6.6L V-8 Turbo, a maximum
trailering capacity of up to 13,000 lbs1with a conven-
tional ball hitch, or up to 17,800 lbs1with a fifth-wheel
or gooseneck hitch.
3FOLDING MIRRORS The outside mirrors fold to
make it easier to navigate tight spaces. Available
camper mirrors (shown at bottom right) extend to
give you a wide view, and you can retract them when
parking in narrow spaces.
4RECIRCULATING BALL STEERING Sierra HD
models feature recirculating ball power steering.
The high-capacity power steering pump and large
reservoir help to give a constant level of assist, even
when operating at the maximum weight.
LOADED EVEN BEFORE YOU LOAD IT. No matter which one you choose, Sierra 2500HD and Sierra 3500HD ingeniously combine brains and
brawn. They’re equipped with features (as well as available options) that will help bring any job down to size, while making your travels feel nearly effortless.
The following are just a few of the features that make Sierra HD the heavy favorite in heavy dutys.
FEATURES & BENEFITS | 10
1
2 3 4
EXTERIOR FEATURES

SIERRA 3500HD
5SIERRA 3500 DENALI HD Our Sierra 3500
Denali HD is the ultimate expression of Professional
Grade engineering. It offers an available maximum
payload of up to 5484 lbs2and maximum trailering
of up to 22,800 lbs1with the available Duramax Diesel
6.6L V-8 Turbo.
6WIDE-VIEW MIRROR All 3500HD models come
standard with vertical camper-style, convex spotter
surface mirrors that help you see what’s along your
sides when you’re trailering a wide load.
7TRAILERING CAPACITY An impressive 1-ton
maximum fifth-wheel trailering capacity of up to
23,100 lbs1and a GCWR of 30,500 lbs.3
PAYLOAD CAPACITY The 3500HD Regular Cab 2WD
Long Box with dual rear wheels offers a maximum
payload capacity of up to 7222 lbs.2If it’s cargo and
crew you need to haul, or a combination of both, the
Sierra Crew Cab is a Sierra built for the heaviest of
heavy-duty jobs.
FEATURES & BENEFITS | 11
1Maximum trailer weight ratings are calculated assuming a base
vehicle, except for any option(s) necessary to achieve the rating, plus
driver. The weight of other optional equipment, passengers and cargo
will reduce the maximum trailer weight your vehicle can tow. See your
GMC dealer for additional details. 2Maximum payload capacity
includes weight of driver, passengers, optional equipment and cargo.
3When properly equipped, includes weight of the vehicle and trailer
combination, including the weight of driver, passengers, fuel, optional
equipment and cargo in the vehicle and trailer.
5
6 7

FEATURES & BENEFITS | 12
BUSINESS CLASS. Climb into the cab of a Sierra HD and you’ll quickly realize everything that surrounds you has been purpose-built for your needs.
From the integration of advanced technologies to the supportive seats to carefully calculated storage bins, Sierra HD’s spacious interior is designed to put
the driver in control and passengers at ease. After all, GMC engineers feel work shouldn’t be without its comforts.
INTERIOR FEATURES
8POWER FRONT SEATING Get comfortable with
power-adjustable front seats. Power driver-seat
adjustment is available for 40/20/40 seating with
select equipment packages, and power driver and
passenger seats are included with all bucket seats in
SLE (six-way), SLT (10-way) and Denali (12-way).
9HEATED AND COOLED FRONT SEATS The
ultimate in all-weather comfort, these seats are
appointed in a perforated leather that allows the
cooling feature to circulate air between you and
the seat surface. They are standard on Denali and
available on SLT models.
POWER-ADJUSTABLE PEDALS To help drivers of
varying sizes sit at a comfortable distance from the
steering wheel, adjustable pedals with memory are
available on SLE and SLT models, and are standard
on Denali.
HEATED STEERING WHEEL Exclusive to Denali,
the leather-wrapped, heated steering wheel adds
soothing warmth whenever the driver demands it.
BLUETOOTH®1FOR PHONE Extend your
capabilities by activating the available Bluetooth
feature. This lets your Bluetooth device work
through the vehicle’s controls and features already
installed in your Sierra HD, including hands-free
operation and dialing.
1Go to gmtotalconnect.com to find out which phones are
compatible with the vehicle.
CLIMATE CONTROL All Sierra models are equipped
with air conditioning. Automatic dual-zone climate
control with individual settings for the driver and
right-front passenger is standard on SLT and Denali,
and available on SLE.
DRIVER INFORMATION CENTER Staying in touch
with important vehicle information is as easy as
pressing a button. The Driver Information Center
includes the odometer and trip odometers, as well as
a message center that includes vital vehicle functions
and driving conditions. SLE, SLT and Denali include a
compass and outside temperature indicator.
8 9

11
FEATURES & BENEFITS | 13
THAT’S EASY.Available on Sierra HD are a number of advanced features to enhance your level of convenience. Each helps transform ordinary tasks,
like starting the vehicle, searching for a song and backing into a parking space, seamlessly integrating innovative technologies to create an exceptional
driving experience. These are features you shouldn’t leave home without.
CONVENIENCE FEATURES
12 UNIVERSAL HOME REMOTE Never get locked
out again. This available remote can be easily
programmed to operate the majority of garage-
door-opening systems and has the benefit of never
needing batteries.
ULTRASONIC REAR PARKING ASSIST This available
system sends out ultrasonic waves that act like rear
bumper radar to alert you to the distance of objects
up to 8 feet behind the vehicle. The system operates
at speeds less than 5 mph. The closer you are, the
faster it beeps.
10 REAR-VISION CAMERA SYSTEM Make it
easier to back up to a trailer or negotiate a tight
space. This available system places a monitor in your
rearview mirror (or navigation screen, if equipped)
to display a view of the area behind the vehicle. The
Rear-Vision Camera does not replace driver vision.
Please use proper care when backing up.
13 STEERING-WHEEL-MOUNTED RADIO
CONTROLS Access your audio system with your
fingertips while you keep your eyes on the road.
These available fingertip controls can also manage
most music search features of compatible MP3 and
iPod® players, as well as Bluetooth2for phone.
2Go to gmtotalconnect.com to find out which phones are
compatible with the vehicle.
11 REMOTE VEHICLE START This available feature
lets you start your vehicle from up to 195 feet away.
Your Sierra HD will run for up to 10 minutes. If equipped
with the automatic climate control system, it will
default to heating or cooling mode based on the
outside temperature.
10 12 13

WORK HARD. PLAY HARD. Sierra HD is available with a range of entertainment technologies to enhance your drive. The quiet cabin is the ideal
starting point for you and your passengers to enjoy available audio and the DVD Rear-Seat Entertainment System. Finding the information, music and video
you want is easy thanks to steering-wheel and touch-screen controls at your fingertips.
14 BOSE® AUDIO SYSTEMS Bose audio is
engineered to give you the realism and presence of
a live performance. Standard on SLT and available
on SLE models, Bose audio features steering-
wheel-mounted radio controls and a premium
speaker system.
BOSE CENTERPOINT® SOUND Denali models
include Bose Centerpoint surround sound with
SurroundStage® signal processing for the sensation
of a live performance. This technology, along with
AudioPilot® noise compensation, wraps you in sound,
delivering five independent channels from existing
two-channel recordings.
15 REAR-SEAT ENTERTAINMENT SYSTEM
Available in SLT and Denali Crew Cab models,
rear-seat passengers will enjoy this system that
includes a DVD player and 8" diagonal flip-down
screen. It also comes with a separate upper DVD slot
in the radio to let front-seat passengers control the
DVD or music playing behind them. It’s compatible
with most popular video gaming systems.
AUXILIARY INPUT This available feature
accommodates most MP3 players and devices,
including many smartphones. So you can bring the
music and entertainment you love to your Sierra just
by plugging in.
16 TOUCH-SCREEN NAVIGATION SYSTEM1
For easy operation, the available system includes
a large 7" diagonal in-dash touch-screen display,
2-D or 3-D map graphics and 3 months of
NavTraffic.2OnStar3subscribers can also use this
system with OnStar Turn-by-Turn Navigation
assistance (6 months standard). The screen also
serves as a large, easily read monitor for the
available Rear-Vision Camera System.
1Map coverage for Puerto Rico and the U.S. Virgin Islands available
on separate disc. Coverage not available for portions of Canada.
2If you subscribe after your trial period,
subscriptions are continuous
until you call SiriusXM to cancel.
See SiriusXM Customer
Agreement for complete terms and geographic limitations at
siriusxm.com. Other fees and taxes will apply. All fees and
programming subject to change. 3Visit onstar.com for coverage
map, details and system limitations.
USB PORT4Plug your digital devices into the
available USB port in the center console.
4Not compatible with all devices.
SIRIUSXM SATELLITE RADIO/NAVTRAFFIC5
Enjoy SiriusXM Satellite Radio with a 3-month trial
subscription to the XMPremier Package. Get over 130
channels, including commercial-free music, plus
sports, news, talk, comedy and entertainment. With
NavTraffic, you’ll get continuously updated traffic
information, right on your vehicle’s available
navigation system.
5If you subscribe after your trial period,
subscriptions are continuous
until you call SiriusXM to cancel.
See SiriusXM Customer Agreement
for complete terms and geographic limitations at siriusxm.com.
Other fees and taxes will apply. All fees and programming subject
to change.
ENTERTAINMENT
161514
FEATURES & BENEFITS | 14

FEATURES & BENEFITS | 15
SAFETY
AUTOMATIC CRASH RESPONSE7In many crashes,
built-in sensors can automatically alert an OnStar
Advisor who is immediately connected into your
vehicle to see if you need help sent to your exact
location—even if you can’t respond.
CRISIS ASSIST During severe weather or other crisis
situations, OnStar offers assistance to help you connect
with loved ones and navigate your way to safety.
EMERGENCY SERVICES If someone in your Sierra
HD needs emergency help, the OnStar emergency
button gives you a priority connection to a specially
trained Advisor at any time, day or night.
ROADSIDE ASSISTANCE8If you’re stranded, run out
of gas or have a flat tire—one push of the OnStar
button can immediately connect you to an Advisor,
ready to help any hour of the day or night.
REMOTE DOOR UNLOCK9If you get locked out
of your Sierra HD, OnStar can help. An OnStar
Advisor can send a signal to your Sierra HD that
usually unlocks the doors within minutes.
REMOTE HORN AND LIGHTS Can’t remember
where you parked? Call the toll-free number and
OnStar will send a signal to flash your lights and
sound your horn to help you locate your Sierra HD.
STOLEN VEHICLE ASSISTANCE9If your Sierra HD
is ever stolen, OnStar can help locate it after
verification with law enforcement.
CONNECTIONS
HANDS-FREE CALLING10 With voice-activated dialing,
available OnStar Hands-Free Calling is built into
your Sierra HD. Push the voice command button,
call out the number and you’re free to keep your
eyes on the road.
TURN-BY-TURN NAVIGATION OnStar Turn-By-Turn
Navigation is simple—all you have to do is push your
blue OnStar button and ask the OnStar Advisor to
download directions to your Sierra HD.
ONSTAR eNAV WITH MAPQUEST.COM™Get a head
start on a trip by checking out your destination on
mapquest.com. With OnStar eNav, just click the
“Send” link on the Web site, and directions will be sent
to your vehicle.
DESTINATION DOWNLOAD With the optional
Navigation System, simply press your blue OnStar
button, and a trained Advisor will download directions
to your Sierra HD’s navigation screen.
ONSTAR REMOTELINK11 KEY FOB SERVICES12
Unlock. Start. Find. From anywhere. New this year,
OnStar RemoteLink Key Fob Services are included
for 5 years on OnStar-equipped 2014 vehicles
when you download the app and use RemoteLink
services during the 6-month trial period and any
consecutive periods with an OnStar plan. Services
include remote door unlock and lock, remote start
and stop (requires factory-installed remote start)
and remote horn and lights.
FRIENDS IN HIGH PLACES Standard for 6 months, the OnStar
Directions & Connections Plan6lets you speak to a live OnStar Advisor just by
pressing the blue OnStar button on your rearview mirror.
ONSTAR FEATURES
²
2-YEAR/24,000-MILE RECOMMENDED
SCHEDULED MAINTENANCE13
²
3-YEAR/36,000-MILE BUMPER-TO-BUMPER
LIMITED WARRANTY14
²
5-YEAR/100,000-MILE POWERTRAIN
LIMITED WARRANTY14
GMC PRO GRADE PROTECTION
PROFESSIONALGRADE COVERAGE.
To make sure GMC’s Professional Grade engineering stays
that way, Pro Grade Protectionis now standard on every
2014 Sierra HD. From scheduled maintenance to protecting
the entire vehicle and the powertrain in between, you
can drive with confidence knowing that Professional
Grade doesn’t simply describe your Sierra HD’s design and
engineering, it’s how well we protect it, too.
6Visit onstar.com for coverage map, details and system limitations. 7OnStar acts as a link to existing emergency service
providers. Not all vehicles may transmit all crash data. 8Roadside service provided by Allstate Roadside Services.
9Services vary by model and conditions. 10Visit onstar.com for coverage map, details and system limitations. OnStar
Hands-Free Calling requires existing OnStar service contract and prepaid minutes. Not available in certain markets. Calls
can be made in U.S. and Canada only. 11Available on select Apple,® Android™ and BlackBerry® devices. Services vary by
device, vehicle and conditions. Requires an active OnStar subscription. 12Access is available for 5 years from the date of
vehicle delivery and is transferable. Does not include any emergency services or other OnStar services. To cancel OnStar
RemoteLink Key Fob Services or if your vehicle is sold, it is important to contact an OnStar Advisor. See onstar.com/mobile
for full details. 13Covers only scheduled oil changes with filter, tire rotations and 27-point inspections, according to your
new vehicle’s recommended maintenance schedule for up to 2 years or 24,000 miles, whichever comes first. Does not
include air filters. Maximum of 4 service events. See participating dealer for other restrictions and complete details.
14Whichever comes first. See dealer for limited warranty details.

VORTEC 6.0L V-8 ENGINE To give you
uncompromised power and torque for confident
daily driving, passing and trailering, look no further
than the Vortec 6.0L V-8 engine. It uses innovative
“vortex technology” to swirl and tumble incoming
air and fuel for optimum power and response.
E85 FLEXFUEL CAPABILITY1The Sierra 6.0L gas
V-8 engine is capable of running on E85 ethanol,
an advanced biofuel.
1E85 FlexFuel capability is not available in AZ, CA, CT, DE, MA, MD,
ME, NJ, NY, OR, PA, RI, VT and WA. E85 is a combination of 85%
ethanol and 15% gasoline. Go to afdc.energy.gov/afdc/fuels to see
if there is an E85 fuel station near you.
VARIABLE VALVE TIMING (VVT) For easy
responsiveness in low-speed city driving and bold
power for open-road passing or trailering, the Vortec
6.0L V-8 features VVT. It monitors and changes valve
open and close points for near-peak levels of torque
across the entire range of engine speeds.
17 DURAMAX DIESEL 6.6L V-8 TURBO With
direct-injection technology that helps it start in as
little as 3.0 seconds at -30°F and a sophisticated
Allison® transmission with overdrive, the available
Duramax Diesel 6.6L gives you a maximum highway
range of up to 650 miles on a single fill-up.2
2Based on GM testing and fuel-tank capacity. Your range may be less.
DURAMAX B20 BIODIESEL CAPABILITY To reduce
carbon-dioxide emissions and stretch your fuel
budget, the Duramax 6.6L can operate on B20
biodiesel, a mix of 20 percent biodiesel from domestic,
renewable resources, and 80 percent petroleum diesel.
DURAMAX HIGH-PRESSURE DIRECT INJECTION
For fast starts in cold weather, quieter operation and
maximum efficiency, the direct-injection system
operates at nearly 30,000 psi to turn heavy diesel
fuel into a fine mist, burning clean and fast with
lower emissions.
CNG Dedicated Compressed Natural Gas (CNG) fuel
systems are available on Sierra 2500HD Crew Cab
models. CNG vehicles are equipped with a specially
designed 6.0L Vortec engine built for gaseous fuel,
along with an integrated and warranted dedicated
gaseous fuel system in place.
OIL LIFE MONITOR For long life and durability,
nothing is more important than changing your oil
at the right time. GMC engineered the mystery out
of this essential service with the Oil Life Monitor.
It calculates how much life your oil has left, based
on when and how you drive. Then, it updates you
with a telltale on your Driver Information Center.
ONSTAR VEHICLE DIAGNOSTICS3Standard with
your 6-month trial subscription to OnStar, the OnStar
Vehicle Diagnostics service can run hundreds of
checks of your engine, transmission, antilock brakes
and more, then organize the information into an
easy-to-read monthly report. OnStar can also run
a check of your vehicle as you drive just by pressing
the blue button and asking the Advisor for an
On-Demand Diagnostics check.
3Visit onstar.com for details and system limitations.
POWER, PACKED. To make sure your heavy-duty work demands are
accomplished with ease, Sierra 2500HD and 3500HD models offer Vortec
gasoline and Duramax Diesel V-8 engines. No matter which you choose, you’ll
have plenty of what you demand from a heavy-duty pickup: power and torque.
HD ENGINES
HEAVY-DUTY ENGINES
VORTEC 6.0L V-8 VVT (L96)
HORSEPOWER: 360 hp @ 5400 rpm4
TORQUE: 380 lb-ft @ 4200 rpm
FlexFuel Capable
43
/
4-ton models. See page 28 for full engine specifications.
DURAMAX DIESEL 6.6L V-8 TURBO
HORSEPOWER: 397 hp @ 3000 rpm
TORQUE: 765 lb-ft @ 1600 rpm
FEATURES & BENEFITS | 16
17
6.0L V-8 SFI BI-FUEL (LC8)
HORSEPOWER: 360 hp @ 5400 rpm (gasoline)
301 hp @ 5000 rpm (CNG)
TORQUE: 380 lb-ft @ 4200 rpm (gasoline)
333 lb-ft @ 4200 rpm (CNG)

POWER, DELIVERED. A pickup truck’s transmission and driveline components are critical to translating every
rotation of the engine’s crankshaft into power at the drive wheels—power to tow and haul, power to pass, power to grip snow-
covered asphalt or gravel-strewn back roads. GMC Sierra HD offers a range of robust yet refined transmissions precisely
matched to maximize the power delivery, efficiency and load demands of our HD engines.
TRANSMISSION/DRIVETRAIN
18
EATON® HEAVY-DUTY AUTOMATIC LOCKING
REAR DIFFERENTIAL No other competitor in its
class offers an available fully automatic locking rear
differential for on- and off-road use. Available on
Sierra 2500HD and standard on 3500HD, the Eaton
locker senses when there’s a difference in rotational
speed between the left and right rear wheels of
approximately 100 rpm. It then locks the differential
to turn both rear wheels in unison for added traction.
TOW/HAUL MODE To give you more power to
accelerate, Tow/Haul mode raises transmission
upshift points. This feature also helps you slow your
Sierra by raising downshift points, which uses engine
compression to slow your Sierra.
AUTOMATIC ENGINE GRADE BRAKING Standard
with gas-engine 6-speed automatic transmissions,
Grade Braking automatically senses when you want
to slow your Sierra, and when the conditions are met,
engages a Grade Braking shift schedule that helps
you maintain your desired speed.
HEAVY-DUTY 6-SPEED AUTOMATIC WITH
OVERDRIVE Sierra HD’s Vortec 6.0L V-8 is mated
to a 6-speed automatic with overdrive. It’s a
sophisticated tool featuring Tow/Haul mode, Driver
Shift Control and Automatic Engine Grade Braking
to help you use the full potential of Sierra HD.
DRIVER SHIFT CONTROL Move through the gears
like a manual with the convenience of an automatic.
Move the shift lever to “M,” and you get fingertip “tap
up/down” range control of transmission gear selection.
Included with select automatic transmissions.
18 ALLISON® 1000 SERIES 6-SPEED AUTOMATIC
WITH OVERDRIVE How do you handle the 765 lb-ft
of torque produced by Sierra HD’s available Duramax
Diesel engine? GMC engineers specified the Allison
1000 Series 6-speed automatic with overdrive for its
heavy-duty strength and durability. Designed by the
same company that makes transmissions for military
tanks, this transmission is the exclusive partner for
the available Duramax Diesel engine.
AUXILIARY EXTERNAL TRANSMISSION OIL
COOLER An air-to-oil auxiliary cooling unit helps
keep transmission temperatures in check—especially
critical when trailering or plowing snow.
FEATURES & BENEFITS | 17

19
20
STRENGTH WITH SMARTS.
There’s a critical difference between just driving
a truck and commanding a GMC Sierra HD: its
chassis and control systems. GMC engineers took
the powerful drivetrains of Sierra and mounted
them to a strong, rigid frame—built specifically for
heavy-duty capabilities. Then they gave the chassis
advanced control systems designed to make driving
Sierra HD easier under the heaviest loads.
CHASSIS AND CONTROL SYSTEMS
19 FULLY BOXED FRAME Crafted from high-
strength steel, the HD frame is fully boxed along
its entire length, with fully welded (not riveted)
brackets and cross-members. Tubular cross-
members are through-rail welded for significantly
added strength and resistance to twisting over
rough surfaces.
20 MULTILEAF REAR SPRINGS To handle heavy-
duty payloads, GMC engineers outfitted Sierra HD
models with rear leaf springs that are 3 inches wide—
two-stage for 2500HD models and three-stage for
3500HD models.
TORSION-BAR DESIGN The Sierra HD frame uses
a torsion-bar suspension. Pioneered for pickups by
GMC, the torsion bar is designed to support different
front axle loads and to retain proper trim height.
STABILITRAK A stability control system that’s
standard on all Single Rear Wheel (SRW) Sierra
models, StabiliTrak senses when your vehicle is not
responding to steering inputs and adjusts engine
speed and applies brake pressure to any individual
wheel to help maintain directional control.
TRACTION CONTROL SYSTEM To make the most of
available traction on many road surfaces, traction
control measures and compares the speed of your
wheels. If it senses one or more wheels starting to
spin, such as on a slippery surface, the system
applies individual brakes and manages engine power
to slow the wheel down and maintain traction so you
can move forward with a better sense of control.
FEATURES & BENEFITS | 18
INDEPENDENT FRONT SUSPENSION For ride
comfort without sacrificing strength, Sierra HDs
have an independent front suspension designed
specifically for the constant punishment of heavy-
duty use. With a maximum unsurpassed pickup
Gross Front Axle Weight Rating of up to 6000
lbs,1this torsion-bar suspension design allows
you to make seasonal ride-height adjustments in
minutes, with a single wrench.
1Capabilities and weight ratings are dependent upon model,
engine, transmission and GVWR combinations. See your GMC
dealer for details.