GMC 2007 Sierra - Manual (Page 145)

Range Selection Mode
(Allison Transmission
® )
If your truck has an Allison Transmission ® your
vehicle has a Range Selection System.
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 select the
desired range of gears for your current
driving conditions.
The Range Selection Mode allows you to
control the 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 265
and DIC Operation and Displays on page 266
for more information.
While using the Range Selection mode, cruise
control and the Tow/Haul mode can be used.
Grade braking is not available while in the Range
Selection mode. See Tow/Haul Mode on
page 147 for more information.
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