GMC 1999 Suburban Owner's Manual page 203

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D
As you are backing down the hill, put your left hand
on the steering wheel at the 12 o'clock position. This
way, you'll be able to tell if your wheels are straight
and maneuver as you back down. It's best that you
back down the hill with your wheels straight rather
than in the left or right direction. Turning the wheel
too far to the left or right will increase the possibility
of a rollover.
Here are some things you must not do if you stall, or are
about to stall, when going up a hill.
D
Never attempt to prevent a stall by shifting into
NEUTRAL (N) to "rev
forward momentum. This won't work. Your vehicle
will roll backwards very quickly and you could go
out of control.
Instead, apply the regular brake to stop the
vehicle. Then apply the parking brake. Shift to
REVERSE (R), release the parking brake, and
slowly back straight down.
D
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's steep enough to cause you to
roll over if you turn around. If you can't make it up
the hill, you must back straight down the hill.
-
up" the engine and regain
Q:
Suppose, after stalling, I try to back down the
hill and decide I just can't do it. What should
I do?
A:
Set the parking brake, put your transmission in
PARK (P) 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 (N) when you leave the vehicle.
Leave it in some gear.
CAUTION:
Shifting the transfer case to NEUTRAL (N) can
cause your vehicle to roll even if the transmission is
in PARK (P). This is because the NEUTRAL (N)
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). But do not shift the transfer case to the
NEUTRAL (N) position. Leave the transfer case in
the 2 Wheel High, 4 High or 4 Low position.
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