GMC 1993 Jimmy Owner's Manual page 201

Here are some things you must not do if you stall,
of
&E
about to stall,
when going up a hill.
Never attempt to prevent a stall by shifting into
N (Neutral) (or depressing
the clutch, if you have a manual transmission) to "rev-up" the engine and
regain 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 into reverse, release the parking brake, and slowly
back down.
Never attempt to turn around i f 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 down the hill.
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 P (Park) (or the manual
transmission in first gear), 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 N (Neutral)
when you leave the vehicle. Leave it in some gear.
If
you
have
a
manual transfer case shift lever, shifting the transfer
transmission is in
P {Park) for,
if you have the manual transmission,
even if you're in gear). This is because the N
(Neutral)
position on
the transfer case overrides the transmission. I f you are going to
leave
your
vehicle, set the parking brake and shift the transmission
to .P (Park)
(or,
put your manual transmission in first gear).
But
do
not shift the transfer case to the
N
(Neutral) position. Leave
the
transfer case in the 2 WHEEL, 4 HIGH or 4 LOW position.
A
case to N (Neutral) can cause
your vehicle to roll even i f the
Driving Downhill
When off-roading takes you downhill, you'll want to consider a number of
things:
How steep is the downhill? Will I be able to maintain vehicle control?
What's the surface like? Smooth? Rough? Slippery? Hard-packed dirt?
Gravel?
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