2001 GMC Sierra 1500 Pickup Owner's Manual - Page 117

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. See the appropriate text for the transfer case in your vehicle. Manual Transfer Case (If Equipped) NOTICE: Driving in the 4-WHEEL HIGH (4HI) or 4-WHEEL LOW (4LO) positions for a long time on dry or wet pavement could shorten the life of your vehicle's drivetrain. 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. 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. Some delay between shifting and the indicator's lighting is normal. 2-34