GMC 1995 Suburban Owner's Manual page 207

your brakes and they won't have to do all the work. Descend slowly,
keeping your vehicle under control at all times.
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Are there some things I should not do when driving down a hill?
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 dawn 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 NEUTRAL (N), 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.
Am I likely to stall when going downhill?
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
brake.
Shift to PARK (P) (or to Neutral with the manual transmission) and,
while still braking, restart the engine.
Shift back to a low gear, release the parking brake, and drive straight
down.
If the engine won't start, get out and get help.
Driving Across an Incline
Sooner or later, an off-road trail will probably go across the incline of a hill.
If this happens, you have to decide whether to t r y to drive across the incline.
Here are some things to consider:
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A hill that can be drrven straight up or down may be too steep to drive
across. When you go straight up or down a hill, the length of the wheel
base (the distance from the front wheels to the rear wheels) reduces the
likelihood the vehicle will tumble end over end. But when you drive
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