Air Shift Control (Automatic Transmission) - GMC TopKick 2007 Owner's Manual

Gmc topkick 2007
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Air Shift Control (Automatic
Transmission)
To use the rear axle shift control, press the bottom
of the switch to get to the high range. The switch
indicator light will come on when the vehicle is in
the high range. Press the top of the switch to return
to the low range.
112
The rear axle shift
control switch for an
automatic transmission
is located in the
instrument panel
switchbank.
The two-speed axle should be in low range when
you park the vehicle. You will need to engage
the transmission and move the vehicle a little to
assure the axle is in range. Then shift into
PARK (P), apply the parking brake, and shut off
the engine.
To shift up from low to high range while driving,
press the bottom of the rear axle shift control
switch as you are releasing the accelerator pedal.
After the shift has occurred, apply the accelerator
as desired.
To shift from high to low range while driving, press
the top of the rear axle shift control switch as
you release the accelerator pedal. Press the
accelerator pedal slowly until the down shift has
occurred, then apply the accelerator as desired.
For better performance during off-road or under a
heavy load, shift the axle into low range and
then operate the transmission normally.
For better performance on the highway, shift the
axle to high range and operate the transmission
normally.

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