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To use this feature, do the following:
1. Move the shift lever to the MANUAL MODE (M).
When in the MANUAL MODE, the transmission’s
current gear range will be the highest attainable
range with all the lower gears available.
2. Press the plus/minus buttons to upshift or downshift
selecting the desired range of gears for your current
driving conditions.
The Range Selection Mode allows you to control the
vehicle’s engine and vehicle speed while driving
down hill by allowing you to select a desired gear.
The DIC shows the six available ranges with the highest
attainable range shown in brackets. See Driver
Information Center (DIC) on page 3-51 and DIC
Operation and Displays on page 3-52 for more
information.
While using the Range Selection mode feature, cruise
control and the Tow/Haul mode can be used.
Low Traction Mode
(Allison Transmission
®
)
If your vehicle has the DURAMAX
®
diesel engine and
the Allison Transmission
®
, it is equipped with a Low
Traction Mode that assists in vehicle acceleration when
road conditions are slippery, such as ice or snow.
While at a stop, selecting the second gear range using
the Range Selection system, will allow the Allison
Transmission
®
to limit torque to the wheels after it
detects wheel slip, preventing the tires from spinning.
Notice: Spinning the tires or holding the vehicle in
one place on a hill using only the accelerator
pedal may damage the transmission. If you are
stuck, do not spin the tires. When stopping on a hill,
use the brakes to hold the vehicle in place.
Cold Weather Operation
(Allison Transmission
®
)
On cold days, approximately 32°F (0°C) or colder, your
automatic transmission is designed to shift differently.
The transmission uses a warm-up mode shift schedule
until the engine reaches normal operating temperature.
While the transmission is in warm-up mode it is
normal for transmission upshifts to be delayed or held
longer. This feature improves heater performance
by giving quicker vehicle warm-ups.
When temperatures are below −13°F (−25°C), the
transmission will prevent certain operations to protect
against damage. When active the DIC will display
the message “Trans in Warm-up”.
See DIC Warnings and Messages on page 3-54 for
more information.
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