Front Axle Locking Feature - GMC 2001 Sierra 1500 Pickup Owner's Manual

Four Wheel Drive (If Equipped)
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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
drive, you must be familiar with its operation. Read the
part that follows before using four
appropriate text for the transfer case in your vehicle.
NOTICE:
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Driving in the 4 WHEEL HIGH (4HI) or
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4 WHEEL LOW (4LO) 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.
2-34
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wheel
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wheel drive. See the
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
Some delay between shifting and the indicator's lighting
is normal.
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wheel drive.
The 4WD indicator will
light up when you shift into
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four wheel drive and the
front axle engages.