1998 GMC Suburban Owner's Manual - Page 99

4-Wheel Low (4L): This setting also engages your front axle to give you extra power and a higher driveline ratio. This position should be used only for off-road driving. You CUI shift from 2-WHEEL HIGH (2H) to 4-WHEEL HIGH (4H) or from 4-WHEEL HIGH (4H)to 2-WHEEL HIGH (2H) while the vehicle is moving. Your front axle may engage faster if you take your foot off' the accelerator for a few seconds after you shift. I n extremely cold weather, it may be necessary to stop or slow the vehicle to shift into 4-WHEEL HIGH (4H). To shift into or out of4-WHEEL LOW (4L) or N (NEUTRAL): Remember that driving i n 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 YOLIT transfer case harder to shift and run noisier. When your headlamps or parking la~nps on, rotate are the t l ~ u m b wheel next to the headlamp switch up to brighten, and down to dim your transfer case indicator light. Automatic Transfer Case(If Equipped) 1 . Slow the vehicle to a roll, about I to 3 mph (2 to 5 krn/h) and shift the transmission into NEUTRAL (N). 2. Shift the transfer case shift level- in one quick, continuous motion. Don't pause in NEUTRAL (N)as you shift the transfer case into 4-WHEEL LOW (4L), or the gears could clash. 2-21