GMC 2013 Sierra Options Manual page 22

CHassis /ConTrol sYsTeMs
There's a critical difference between just driving a truck and commanding a GMC sierra. one fundamental source of that difference: the sierra chassis and
control systems. GMC engineers took the powerful drivetrains of sierra and mounted them to strong, rigid frames—one for sierra 1500 and another built
for sierra Hd models. Then they gave each chassis advanced control systems designed to make driving sierra and sierra Hd easier under heavy load. one
example: stabiliTrak, a stability control system standard on all single rear Wheel (srW) sierra models. sensing when your vehicle is not responding to your
steering inputs, stabiliTrak adjusts engine speed and applies brake pressure to any individual wheel to help maintain directional control.
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sierra 1500
SIERRA 1500 FRAME To help FULLY INDEPENDENT FRONT
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resist bending, twisting and SUSPENSION on sierra 1500
shaking, sierra 1500 frames models, our coil-over-shock front
feature a hydroformed front suspension delivers improved
section and are fully boxed from ride quality versus torsion-bar
the nose to the spare tire area. designs.
This construction technique
POWER RACK-AND-PINION
essentially welds a frame inside
STEERING power rack-and-pinion
a frame to create a closed "box"
steering provides sierra 1500
section that gives a strong, stable
models with a positive on-center
platform for the engine and cab.
feel at highway speeds, as well
as extra low-speed assist for
maneuvering in tight spaces.
20 | features & Benefits
sierra Hd
STABILITRAK a stability control SIERRA HD FRAME not just a
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system that's standard on all beefed-up light-duty frame, the
single rear Wheel (srW) sierra sierra Hd frame is specifically
models, stabiliTrak senses when engineered for Hd use. Crafted
your vehicle is not responding to from high-strength steel, the Hd
your steering inputs and adjusts frame is fully boxed along its
engine speed and applies brake entire length, with fully welded
pressure to any individual wheel to (not riveted) brackets and
cross-members. Tubular cross-
help maintain directional control.
members are through-rail welded
for significantly added strength
and resistance to twisting over
rough surfaces.
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INDEPENDENT FRONT MULTILEAF REAR SPRINGS
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SUSPENSION for ride comfort The more load sierra Hd takes,
without sacrificing strength, sierra the more its springs step up to
Hds have an independent front the task. To handle heavy-duty
suspension designed specifically payloads, GMC engineers specced
for the constant punishment of out sierra Hd models with rear leaf
heavy-duty use. With an available springs that are 3 inches wide—
unsurpassed pickup Gross front two-stage for 2500Hd models and
axle rating of up to 6000 lbs, this three-stage for 3500Hd models.
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torsion-bar suspension design
TORSION BAR DESIGN The
allows you to make seasonal ride-
sierra Hd frame uses torsion bar
height adjustments in minutes,
suspension. pioneered for pickups
with a single wrench.
by GMC, the torsion bar is designed
1 Capabilities and weight ratings are
to support different front axle loads
dependent upon model, engine,
and to retain proper trim height.
transmission and GVWR combinations.
See your GMC dealer for details.