GMC 1995 Jimmy Owner's Manual page 172

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.
Never attempt to prevent a stall by shifting into NEUTRAL (N) (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 straight
down.
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.
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) (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 NEUTRAL (N) when you leave the vehicle. Leave it in
some gear.
4-18