1996 GMC Jimmy Owner's Manual - Page 208

When You Are Ready to Leave After Parking on a Hill It canbe dangerous to get out your vehicle if of the shift leveris not fully in PARK (P) with the parking brake firmlyset. Your vehiclecan 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 have four-wheel drive with a manual transfer case shift lever and your transfer case is in NEUTRAL (N), your vehicle will be free to roll, even if your shift leveris in PARK (P). So, be sure the transfer case in a drive gear not in is NEUTRAL (N). 1 . Apply your regular brakes and hold the pedal down while you: 0 0 Start your englne: Shift into a gear; and 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. -- 4-55