1999 GMC Envoy Owner's Manual - Page 82

yellowblue Automatic Transfer Case The transfer case switches are to the right of the steering wheel on the instrument panel. Use these switches to shift into and out of four-wheel drive. You can choose among four driving settings: 2HI: This setting is 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. 2-22