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t r a n s m i s s i o n / d r i v e t r a i n
power, delivered.
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.
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.
A pickup truck's transmission and driveline components are critical to translating every
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
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.
Standard
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
18
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
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