2007 Chevrolet Silverado 2500 Pickup Owner's Manual - Page 155

An indicator light near the lever shows you the transfer case settings: Notice: Driving on clean, dry pavement in four-wheel drive for an extended period of time may cause premature wear on your vehicle's powertrain. Do not drive on clean, dry pavement in four-wheel drive for extended periods of time. 4L (Four-Wheel Low): This setting also engages the front axle and delivers extra torque. You may never need 4L. It sends maximum power to all four wheels. You might choose 4L if you are driving off-road in deep sand, deep mud, deep snow, and while climbing or descending steep hills. When operating in 4L, the gear ratio provides additional torque when compared to 4H. The transmission gear shift feel will be exaggerated. {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 a manual transmission, even if you are in gear. You or someone else could be seriously injured. Be sure to set the parking brake before placing the transfer case in NEUTRAL. See Parking Brake on page 170. N (Neutral): Shift to this setting only when your vehicle needs to be towed. See Recreational Vehicle Towing on page 418 or Towing Your Vehicle on page 417. 155