GMC 1994 Yukon Owner's Manual page 179

If you decide you can go down a hill safely, then try to keep your vehicle
headed straight down, and use a low gear. This way, engine drag can help
your brakes and they won't have to do all the work. Descend slowly,
keeping your vehicle under control at all times.
Q:
Are there some things I should not do when driving down a hill?
A:
Yes! These are important because if you ignore them you could lose
control and have a serious accident.
When driving downhill, avoid turns that take you across the incline of
the hill. A hill that's not too steep to drive down may be too steep to
drive across. You could roll over if you don't drive straight down.
Never go downhill with the transmission in "N" (Neutral)
, or
with the
clutch pedal depressed in a manual shift
.
This is called
"free-wheeling." Your brakes will have to do all the work and could
overheat and fade.
Q:
Am I likely to stall when going downhill?
A:
It's much more likely to happen going uphill. But if it happens going
downhill, here's what to do.
Stop your vehicle by applying the regular brakes. Apply the parking
Shift to
" P '
(Park) (or to Neutral with the manual transmission) and,
brake.
while still braking, restart the engine.
down.
Shift back to a low gear, release the parking brake, and drive straight
0
If the engine won't start, get out and get help.
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