2006 Chevrolet Tahoe Owner's Manual - Page 119

The transfer case buttons are located to the left of the instrument panel cluster. You can choose among four driving settings: AUTO 4WD (Automatic Four-Wheel Drive): This setting is ideal for use when road surface traction conditions are variable. When driving your vehicle in AUTO 4WD, the front axle is engaged, but the vehicle's power is sent only to the rear wheels. When the vehicle senses 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 the four-wheel high position 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. The front axle locks and unlocks automatically when you shift the transfer case. Some delay for the axle to lock or unlock is normal. For information on StabiliTrak®, see StabiliTrak® System on page 4-9. Use these buttons to shift into and out of four-wheel drive. 2-27