GMC 2000 Sierra - Manual (Page 106)

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Four - Wheel Drive (If Equipped)
If your vehicle has four - wheel drive, you can send your
engine’s driving power to all four wheels for extra
traction. To get the most satisfaction out of four
- wheel
drive, you must be familiar with its operation. Read the
part that follows before using four
- wheel drive. See the
appropriate text for the transfer case in your vehicle.
NOTICE:
Driving in the 4 - WHEEL HIGH (4H) or
4 - WHEEL LOW (4L) positions for a long time
on dry or wet pavement could shorten the life of
your vehicle’s drivetrain.
Front Axle Locking Feature
The front axle locks and unlocks automatically when
you shift the transfer case. Some delay for the axle to
lock or unlock is normal.
Manual Transfer Case (If Equipped)
The transfer case shift lever is on the floor to the right of
the driver. Use this lever to shift into and out of
four
- wheel drive.
The 4WD indicator will
light up when you shift into
four
- wheel drive and the
front axle engages.
Some delay between shifting and the indicator’s lighting
is normal.