GMC 2004 Sierra 1500 Pickup Owner's Manual page 132

NEUTRAL (N): Shift to this setting only when your
vehicle needs to be towed. See Recreational Vehicle
Towing on page 4-54 or Towing Your Vehicle on
page 4-53 .
4-Wheel Low (4L0): 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.
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).
When Using the Manual Transfer Case
•
All shifts should be made using quick motions. Slow
shifts may make it harder to shift.
•
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.
2-38
•
While in 4-Wheel (4HI) or 4-Wheel Lo (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.
•
While in 4HI, your vehicle can be driven at any
posted legal speed limit.