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C H a s s i s a n d C o n t r o l s y s t e m s
s t r e n G t H w i t H s m a r t s .
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.
fully Boxed frame
Crafted from high-
19
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.
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,
1
this torsion-bar suspension design allows
you to make seasonal ride-height adjustments in
minutes, with a single wrench.
1
Capabilities and weight ratings are dependent upon model,
engine, transmission and GVWR combinations. See your GMC
dealer for details.
20
multileaf rear sprinGs
To handle heavy-
20
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.
19
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.
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