Chevrolet 2007 Silverado 1500 Pickup Owner's Manual page 378

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Never attempt to turn around if you are about to
stall when going up a hill. If the hill is steep
enough to stall your vehicle, it is steep enough
to cause you to roll over if you turn around. If
you cannot make it up the hill, you must back
straight down the hill.
Q:
Suppose, after stalling, I try to back down
the hill and decide I just cannot do it. What
should I do?
A:
Set the parking brake, put your transmission
in PARK (P), or the manual transmission in
FIRST (1), and turn off the engine. Leave the
vehicle and go get some help. Exit on the
uphill side and stay clear of the path the
vehicle would take if it rolled downhill. Do not
shift the transfer case to NEUTRAL when
you leave the vehicle. Leave it in some gear.
378
CAUTION:
{
Shifting the transfer case to NEUTRAL
can cause your vehicle to roll even if the
transmission is in PARK (P) (or, if you
have the manual transmission, even if you
are in gear). This is because the
NEUTRAL position on the transfer case
overrides the transmission. You or
someone else could be injured. If you are
going to leave your vehicle, set the
parking brake and shift the transmission
to PARK (P) (or, put your manual
transmission in FIRST (1)). But do not
shift the transfer case to NEUTRAL. Leave
the transfer case in the Two-Wheel High,
Four-Wheel High or Four-Wheel Low
position.