1999 Chevrolet Silverado 1500 Pickup Owner's Manual - Page 100

yellowblue Manual Transfer Case (If Equipped) Some delay between shifting and the indicator's lighting is normal. The transfer case shift lever is on the floor to the right of the driver. Use this lever to shift into and out of four-wheel drive. The 4WD indicator will light up when you shift into four-wheel drive and the front axle engages. An indicator on the bezel near the lever shows you the transfer case settings: 2-Wheel High (2H): 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-Wheel High (4H): Use 4HI when you need extra traction, such as 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. 2-28