Chevrolet Silverado 2007 Owner's Manual page 161

Shifting Into Two-Wheel-Drive High
Turn the knob to the Two-Wheel-Drive High
position. This can be done at any speed, except
when shifting from Four-Wheel-Drive Low.
See Shifting Out of Four-Wheel-Drive Low
for more information.
Shifting Into Four-Wheel Drive Low
When Four-Wheel-Drive Low is engaged, vehicle
speed should be kept below 45 mph. Extended
high-speed operation in Four-Wheel-Drive
Low may damage or shorten the life of the
drivetrain.
To shift to the Four-Wheel-Drive Low position, the
ignition must be in RUN and the vehicle must be
stopped or moving less than 3 mph (5 km/h) with
the transmission in NEUTRAL (N). The preferred
method for shifting into Four-Wheel-Drive Low
is to have your vehicle moving 1 to 2 mph
(1.6 to 3.2 km/h). Turn the knob to the
Four-Wheel-Drive Low position. You must
wait for the Four-Wheel-Drive Low indicator
light to stop flashing and remain on before
shifting your transmission in gear.
Notice: Shifting the transmission into gear
before the requested mode indicator light has
stopped flashing could damage the transfer
case. To help avoid damaging your vehicle,
always wait for the mode indicator lights
to stop flashing before shifting the
transmission into gear.
It is typical for your vehicle to exhibit significant
engagement noise and bump when shifting
between Four-Wheel-Drive Low and
Four-Wheel-Drive High ranges or from
NEUTRAL with the engine running.
If the knob is turned to the Four-Wheel-Drive
Low position when your vehicle is in gear and/or
moving, the Four-Wheel-Drive Low indicator
light will flash for 30 seconds and not complete
the shift unless your vehicle is moving less
than 3 mph (5 km/h) and the transmission is
in NEUTRAL (N). After 30 seconds the transfer
case will shift to Four-Wheel-Drive High mode.
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