GMC SIERRA 1997 Manual page 100

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Shifting from
2HI
to 4HI
Press and release the 4HI switch. This can be done at
any
speed, and the front axle will lock automatically
with some delay.
Shifting from 4HI to 2HI
Press and release the 2HI switch. This can be done at
any speed, and the front axle will unlock automatically
with some delay.
Shifting from 2HI
or
4HI to 4LO
To shift from 2HI or 4HI to 4L0, the vehicle must be
stopped or moving less than 3 mph (4.8
km/h)
with the
transmission in NEUTRAL (N). The preferred method
for shifting into 4LO is to have your vehicle moving 1 to
2 mph (1.6 to 3.2
k m / h ) .
Press and release the 4LO
switch. You must wait for the 4LO indicator light to stop
flashing and remain illuminated before shifting your
transmission into gear.
Shifting from
4LO
to 4HI or 2HI
To
shift from 4LO
to
4HI or
2H1,
your vehicle must be
stopped or moving less than 3 mph (4.8
k m / h )
with the
transmission in NEUTRAL (N). The preferred method
for shifting out of 4LO is
to
have your vehicle moving
1 to 2 mph (1.6 to 3.2
km/h).
Press and release the 4HI
switch. You must wait for the 4HI indicator light
to
stop
flashing and remain illuminated before shifting your
transmission into gear.
If the 4HI switch is pressed when your vehicle is in
gear and/or moving, the 4HI indicator light will flash for
30 seconds but will not complete the shift unless the
vehicle is moving slower than 3 mph (4.8
k m / h )
and the
transmission is in NEUTRAL (N).
If the 4LO switch is pressed when your vehicle is in
gear and/or moving, the 4LO indicator light will flash
for 30 seconds and not complete the shift unless your
vehicle is moving slower than 3 mph (4.8
km/h)
and the
transmission is in NEUTRAL (N). After
30
seconds the
transfer case will return to 4HI.
2-26

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