2010 GMC Sierra 1500 Crew Cab Owner's Manual - Page 188

4 n (Four-Wheel-Drive Low): This setting also engages the front axle and delivers extra torque. You may never need this setting. It sends maximum power to all four wheels. You might choose Four-Wheel-Drive Low if you are driving off-road in deep sand, deep mud, deep snow, and while climbing or descending steep hills. If the vehicle has StabiliTrak®, shifting into Four-Wheel-Drive Low will turn Traction Control and StabiliTrak® off. See StabiliTrak® System on page 5‑6. N (Neutral): Shift the vehicle's transfer case to N (Neutral) only when towing the vehicle. See Recreational Vehicle Towing on page 5‑49 or Towing Your Vehicle on page 5‑48 for more information. If the SERVICE 4-Wheel Drive message stays on, you should take the vehicle to your dealer for service. See "Service 4-Wheel Drive message" under DIC Warnings and Messages on page 4‑66. Shifting Into Four-Wheel-Drive High or AUTO (Automatic Four-Wheel Drive) Turn the knob to the Four-Wheel-Drive High or AUTO position. This can be done at any speed, except when shifting from Four-Wheel-Drive Low. The indicator light will flash while shifting. It will remain on when the shift is completed. { WARNING: Shifting the transfer case to N (Neutral) can cause the vehicle to roll even if the transmission is in P (Park). You or someone else could be seriously injured. Be sure to set the parking brake before placing the transfer case in N (Neutral). See Parking Brake on page 3‑54. Shifting Into Two-Wheel-Drive High Turn the knob to the Two-Wheel-Drive High position. This can be done at any speed, except when shifting from Four-Wheel-Drive Low. The indicator light will flash while shifting. It will remain on when the shift is completed. 3-50