1999 Chevrolet Silverado 1500 Pickup Owner's Manual - Page 101

yellowblue You can shift from 2-Wheel High (2H) to 4-Wheel High (4H) or from 4-Wheel High (4H) to 2-Wheel High (2H) while the vehicle is moving. Your front axle will engage faster if you take your foot off of the accelerator for a couple of seconds after you shift. In extremely cold weather, it may be necessary to stop or slow the vehicle to shift into 4-Wheel High (4H). To shift into or out of 4-Wheel Low (4L) or NEUTRAL (N): 1. Slow the vehicle to a roll, about 1 to 3 mph (2 to 5 km/h) and shift an automatic transmission into NEUTRAL (N), or with a manual transmission, press the clutch pedal. 2. Shift the transfer case shift lever in one continuous motion. Don't pause in NEUTRAL (N) as you shift the transfer case into 4-Wheel Low (4L), or your gears could clash. Remember that driving in 4-Wheel High (4H) or 4-Wheel Low (4L) may reduce fuel economy. Also, driving in four-wheel drive on dry pavement could cause your tires to wear faster and make your transfer case harder to shift and run noisier. CAUTION: Shifting the transfer case to NEUTRAL (N) 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 (N). See "Parking Brake" in the Index. NEUTRAL (N): Shift to this setting only when your vehicle needs to be towed. The ignition switch must be in the RUN position in order to shift the lever into NEUTRAL (N). See "Recreational Vehicle Towing"or"Towing your vehicle"in the Index. 4-Wheel Low (4L): This setting also engages your front axle and delivers extra torque. You may never need 4LO. It sends maximum power to all four wheels. You might choose 4LO if you are driving off-road in deep sand, deep mud, deep snow and climbing or descending steep hills. 2-29