GMC 1997 Suburban Owner's Manual page 96

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An indicator near the lever shows you the transfer
case settings:
2-Wheel High (2H): This setting is for driving in most
street and highway situations. Your front axle is not
engaged in two-wheel drive.
4-Wheel High (4H): This setting engages your front
axle to help drive your vehicle. Use 4H when you need
extra traction, such as
on
wet or icy roads, or in most
off-road situations.
Neutral (N): Shift to this setting only when your vehicle
needs to be towed or when using a power take-off.
4-Wheel Low (4L): This setting also engages your front
axle to give you extra power and a higher driveline ratio.
This position should be used only for off-road driving.
You can shift from 2-WHEEL HIGH (2H) to 4-WHEEL
HIGH (4H) or from 4-WHEEL HIGH (4H) to
2-WHEEL HIGH (2M) while the vehicle is moving.
Your front axle may engage faster if you take your foot
off of the accelerator for a few seconds after you shift.
In extremely cold weather, it may be necessary to stop
or slow the vehicle to shift into 4-WHEEL HIGH (4H).
To shift into or out of 4-WHEEL LOW (4L) or
N (NEUTRAL):
1. Slow the vehicle to
a roll, about 1 to 3 mph
(2 to 5 kmk) and shift the transmission into
NEUTRAL (N).
2. Shift the transfer case shift lever in one quick,
continuous motion.
Don't pause in N (NEUTRAL) as you shift the transfer
case into 4-WHEEL LOW (4L), or the gears could clash.
Remember that driving in 4-WHEEL HIGH (4H) or
4-WHEEL LOW (4L) may reduce fuel economy. Also,
driving in four-wheel drive
on
dry pavement could
cause your tires to wear faster and make your transfer
case harder to
shift
and run noisier.
When your headlamps or parking lamps are on, rotate
the thumb wheel next to the headlamp switch up to
brighten, and down to dim your transfer case
indicator light.
2-22

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