2006 GMC Sierra 1500 Pickup Owner's Manual - Page 136

Automatic Transfer Case The transfer case buttons are located to the left of the instrument panel cluster. Recommended Transfer Case Settings Driving Conditions Normal Variable Severe Extreme Vehicle in Tow* Transfer Case Settings 2 m AUTO 4WD YES 4 m 4 n N YES YES YES YES *See Recreational Vehicle Towing on page 4-62 for further information. Use these switches to shift into and out of four-wheel drive. You can choose among four driving settings: Notice: Driving on clean, dry pavement in Four-Wheel-Drive High or Four-Wheel-Drive Low 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 High or Four-Wheel-Drive Low for extended periods of time. 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. 2-42