1997 GMC Suburban Owner's Manual - Page 96

An indicator near the lever shows you the transfer case settings: To shift into or out of 4-WHEEL LOW (4L) or N (NEUTRAL): 1. Slow the vehicle to a roll, about 1 to 3 mph (2 to 5 kmk) and shift the transmission into NEUTRAL (N). 2-Wheel High (2H): This setting is for driving in most street and highway situations. Your front axle is not engaged in two-wheel drive. 4-Wheel High (4H): This settingengages your front axle to help drive your vehicle. Use 4H when you need extra traction, such as on wet or icy roads, or in most off-road situations. Neutral (N): Shift to this setting only when your vehicle needs to be towed or when using a power take-off. 4-Wheel Low (4L): This setting also engages your front axle to give you extra power anda higher driveline ratio. This position should be usedonly for off-road driving. You can shift from 2-WHEEL HIGH (2H) to 4-WHEEL HIGH (4H) or from 4-WHEEL HIGH (4H) to 2-WHEEL HIGH (2M) while the vehicle is moving. Your front axle may engage faster if you take your foot off of the accelerator for a few seconds after you shift. In extremely cold weather, it may be necessary to stop or slow the vehicle to shift into 4-WHEEL HIGH (4H). 2. Shift the transfer case shift lever in one quick, continuous motion. Don't pause in N (NEUTRAL) as you shift the transfer case into 4-WHEEL LOW (4L), the gears could clash. or Remember that driving in 4-WHEEL HIGH (4H) or 4-WHEEL LOW (4L) may reduce fuel economy. Also, driving in four-wheel drive on dry pavement could cause your tires to wear faster and make your transfer case harder to shift and run noisier. When your headlamps or parking lamps are on, rotate the thumb wheel next to the headlamp switch up to brighten, and down to dim your transfer case indicator light. 2-22