GMC 2007 Sierra - Manual (Page 455)

CAUTION: (Continued)
Always put the automatic transmission
shift lever fully in PARK (P) with the
parking brake firmly set. If you have a
manual transmission, turn the engine off
and firmly set the parking brake.
If the transfer case on four-wheel-drive
vehicles is in NEUTRAL, your vehicle will
be free to roll, even if your automatic
transmission shift lever is in PARK (P).
So, be sure the transfer case is in a drive
gear — not in NEUTRAL.
When You Are Ready to Leave After
Parking on a Hill
1. Apply your regular brakes and hold the pedal
down while you:
• Start your engine
• Shift into a gear
• Release the parking brake
2. Let up on the brake pedal.
3. Drive slowly until the trailer is clear of the
chocks.
4. Stop and have someone pick up and store the
chocks.
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