2007 Chevrolet Silverado 3500 Pickup Owner's Manual - Page 449

4. Reapply the regular brakes. Then apply your parking brake and shift into PARK (P) for an automatic transmission, or REVERSE (R) for a manual transmission. 5. If you have a four-wheel-drive vehicle, be sure the transfer case is in a drive gear and not in NEUTRAL. 6. Release the regular brakes. 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. {CAUTION: It can be dangerous to get out of your vehicle if the automatic transmission 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 will not move, even when you are on fairly level ground, use the steps that follow. CAUTION: (Continued) 449