2005 GMC Sierra 1500 Pickup Owner's Manual - Page 129

NEUTRAL (N): Shift to this setting only when your vehicle needs to be towed. See Recreational Vehicle Towing on page 4-62 or Towing Your Vehicle on page 4-62. 4-Wheel Low (4LO): This setting also engages your front axle and delivers extra torque. You may never need 4LO. It sends maximum power to all four wheels. You might choose 4LO if you are driving off-road in deep sand, deep mud, deep snow and climbing or descending steep hills. When operating in 4LO, the gear ratio is extra deep when compared to 4HI. The transmission gear shift feel will be exaggerated. You can shift from 2-Wheel High (2HI) to 4-Wheel High (4HI) or from 4-Wheel High (4HI) to 2-Wheel High (2HI) while the vehicle is moving. Your front axle will engage faster if you take your foot off of the accelerator for a couple of seconds after you shift. In extremely cold weather, it may be necessary to stop or slow the vehicle to shift into 4-Wheel High (4HI). • While in 4-Wheel High (4HI) or 4-Wheel Low (4LO) you may experience reduced fuel economy. • Avoid driving in 4-Wheel Drive on clean, dry pavement. It may cause your tires to wear faster, and make your transfer case harder to shift and run noisier. Shifting from 2HI to 4HI • Shifts between 2HI and 4HI can be made at any vehicle speed. • It is easiest to shift the transfer case when maintaining a constant speed or a slight acceleration. If possible, avoid shifting while slowing down, as it will may make it harder to shift. • Shift your transfer case lever in one continuous motion into either the 4HI or 2HI position. • In extremely cold weather, it may be necessary to slow or stop the vehicle to shift into 4HI until your vehicle has warmed up. When Using the Manual Transfer Case • All shifts should be made using quick motions. Slow shifts may make it harder to shift. • While in 4HI, your vehicle can be driven at any posted legal speed limit. • You may notice that it is harder to shift when the vehicle is cold. When the vehicle warms up the shifting will return to normal. 2-39