2006 Chevrolet Silverado 1500 Pickup Owner's Manual - Page 331

Q: Suppose, after stalling, I try to back down the hill and decide I just cannot do it. What should I do? {CAUTION: Shifting the transfer case to NEUTRAL can cause your vehicle to roll even if the transmission is in PARK (P) (or, if you have the manual transmission, even if you are in gear). This is because the NEUTRAL position on the transfer case overrides the transmission. You or someone else could be injured. If you are going to leave your vehicle, set the parking brake and shift the transmission to PARK (P) (or, put your manual transmission in FIRST (1)). But do not shift the transfer case to NEUTRAL. Leave the transfer case in the Two-Wheel High, Four-Wheel High or Four-Wheel Low position. A: Set the parking brake, put your transmission in PARK (P), or the manual transmission in FIRST (1), and turn off the engine. Leave the vehicle and go get some help. Exit on the uphill side and stay clear of the path the vehicle would take if it rolled downhill. Do not shift the transfer case to NEUTRAL when you leave the vehicle. Leave it in some gear. 4-27