2008 GMC Envoy Owner's Manual - Page 103

Four-Wheel Drive If your vehicle has four-wheel drive, the engine's driving power can be sent to all four wheels for extra traction. To get the most satisfaction out of four-wheel drive, you must be familiar with its operation. Read the part that follows before using four-wheel drive. You should use Two-Wheel High for most normal driving conditions. 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. Notice: If you continually drive your vehicle with the transfer case in AUTO or Four-Wheel Drive, you could shorten the life of the transfer case or the Four-Wheel Drive system. The selector switch should be left in Two-Wheel Drive High mode. Only use AUTO and Four-Wheel Drive when you need extra traction such as in wet or slippery road conditions. Automatic Transfer Case If your vehicle has four-wheel drive, the transfer case knob is located to the right of the steering wheel on the instrument panel. Use this knob to shift into and out of four-wheel drive 2 m (Two-Wheel High): This setting is for driving in most street and highway situations. Your front axle is not engaged in two-wheel drive. It also provides the best fuel economy. 2-29