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GMC 1998 Sonoma Owner's Manual page 94

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Shifting from 2HI or 4HI to 4LO
To shift from 2Hl or 4H1 to 4L0, the vehicle must be
stopped or moving less than 3 mph (4.8 k d h ) with the
transmission in NEUTRAL (Nj in vehicles equipped
with
an
automatic transmission. The clutch pedal must
be engaged on vehicles equipped with a manual
transmission. The preferred method for shifting into
4LO is to have your vehicle moving 1 to 2 mph (1.6 to
3.2 k d 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 or releasing the clutch pedal.
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 (Nj or the clutch
pedal is engaged.
On automatic transmission equipped vehicles, if your
transfer case does not shift into 4L0, your transmission
indicator switch may require adjustment. With your
transmission in NEUTRAL (Nj, press and release the
4LO switch. While the 4LO indicator light is flashing,
shift your transmission into PARK (P). Wait until the
4LO irldicator light
stays on
before shifting
your
transmission into gear. This will get
you
into 4L0, but
you should take your vehicle in for service to restore
normal operation.
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 kmh) with the
transmission in NEUTRAL (N) or the clutch pedal
engaged. The preferred method for shifting out of
4LO is to have your vehicle moving 1 to 2 mph (1.6 to
3.2 kmdh). Press and release the 4HI switch. You must
wait for the 4HT indicator light to stop flashing and
remain illuminated before shifting your transmission
into gear or releasing the clutch pedal.
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 not complete the shift unless the
vehicle is moving slower than 3 mph (4.8 km/h) and
the transmission is in NEUTRAL (N) or the clutch
pedal engaged.
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