Four - Wheel Drive (If Equipped); Front Axle Locking Feature - GMC 1999 Suburban 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
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should use 2 WHEEL HIGH (2H) for most normal
driving conditions.
NOTICE:
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Driving in the 4 WHEEL HIGH (4H) or
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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.
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wheel
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wheel drive. You
Manual Transfer Case (If Equipped)
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