2006 Chevrolet Silverado 1500 Pickup Owner's Manual - Page 135

AUTO 4WD (Automatic Four-Wheel Drive): This setting is ideal for use when road surface traction conditions are variable. When driving your vehicle in Automatic Four-Wheel Drive, the front axle is engaged, but the vehicle's power is sent to the rear wheels. When the vehicle detects a loss of traction, the system will automatically engage four-wheel drive. Driving in this mode results in slightly lower fuel economy than Two-Wheel High. 2 m (Two-Wheel High): This setting is used for driving in most street and highway situations. Your front axle is not engaged in two-wheel drive. This setting also provides the best fuel economy. 4 m (Four-Wheel High): Use this setting when you need extra traction, such a on snowy or icy roads or in most off-road situations. This setting also engages your front axle to help drive your vehicle. This is the best setting to use when plowing snow. 4 n (Four-Wheel Low): This setting also engages your front axle and delivers extra torque. You may never need Four-Wheel Low. It sends maximum power to all four wheels. You might choose Four-Wheel Low if you are driving off-road in deep sand, deep mud, deep snow, and while climbing or descending steep hills. When operating in Four-Wheel Low, the gear ratio provides additional torque when compared to four-wheel high. The transmission gear shift feel will be exaggerated. Indicator lights in the switches show which setting your transfer case is in. The indicator lights will come on briefly when you turn on the ignition and one will stay on. If the lights do not come on, you should take your vehicle to your dealer for service. An indicator light will flash while the transfer case is being shifted. It will stay on when the shift is complete. If for some reason the transfer case cannot make a requested shift, it will return to the last chosen setting. If the SERVICE 4WD message stays on, you should take your vehicle to your dealer for service. See DIC Warnings and Messages on page 3-54 for further information. 2-41 {CAUTION: Shifting the transfer case to NEUTRAL can cause your vehicle to roll even if the transmission is in PARK (P). 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 2-49. N (NEUTRAL): Shift the vehicle's transfer case to N (NEUTRAL) only when towing your vehicle. See Recreational Vehicle Towing on page 4-62 or Towing Your Vehicle on page 4-61 for more information.