1999 GMC Suburban Owner's Manual - Page 89

yellowblue Four-Wheel Drive (If Equipped) If your vehicle has four-wheel drive, you can send your engine's driving power to all four wheels for extra traction. To get the most satisfaction out of four-wheel drive, you must be familiar with its operation. Read the part that follows before using four-wheel drive. You should use 2-WHEEL HIGH (2H) for most normal driving conditions. Manual Transfer Case (If Equipped) NOTICE: Driving in the 4-WHEEL HIGH (4H) or 4-WHEEL LOW (4L) positions for a long time on dry or wet pavement could shorten the life of your vehicle's drivetrain. Front Axle Locking Feature The front axle locks and unlocks automatically when you shift the transfer case. Some delay for the axle to lock or unlock is normal. 2-19