GMC 2004 Sierra 1500 Pickup Owner's Manual page 131

Recommended Transfer Case Settings
Driving Conditions
Normal
Severe
Extreme
Vehicle in Tow*
*See Recreational Vehicle Towing on page 4-54 or
Towing Your Vehicle on page 4-53 for further
information.
An indicator on the bezel near the lever shows you the
transfer case settings:
2-Wheel High (2HI): This setting is used for driving in
most street and highway situations. Your front axle
is not engaged in two-wheel drive. This setting
also provides the best fuel economy.
4-Wheel High (4HI): Use 4HI when you need extra
traction, such as on snowy or icy roads or in most
off-road situations. This setting also engages your front
axle to help drive your vehicle. This is the best setting
to use when plowing snow.
Transfer Case Settings
2HI 4HI 4LO
YES
YES
YES
{
CAUTION:
N
Shifting the transfer case to NEUTRAL can
cause your vehicle to roll even if the
transmission is in PARK (P), or if you have a
manual transmission, even if you are in gear.
YES
You or someone else could be seriously
injured. Be sure to set the parking brake
before placing the transfer case in NEUTRAL.
See Parking Brake on page 2-48 .
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