Pontiac 1999 Montana Owner's Manual page 144

Shifting Into PARK (P)
CAUTION:
It can be dangerous to get out of your vehicle if
the shift lever is not fully in PARK (P) with the
parking brake firmly set. Your vehicle can roll. If
you have left the engine running, the vehicle can
move suddenly. You or others could be injured.
To be sure your vehicle won't move, even when
you're on fairly level ground, use the steps that
follow. If you're pulling a trailer, see "Towing a
Trailer" in the Index.
1. Hold the brake pedal down with your right foot and
set the parking brake with your left foot.
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2. Move the shift lever into PARK (P) like this:
D
Pull the lever toward you.
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