GMC C series 2002 Owner's Manual page 88

Inter Axle Differential Lock Control
-
(If Equipped)
If you're approaching a slippery surface where it looks
like one or even all of the wheels may start to slip, you
can use this control. It locks your rear differentials so
that power is transmitted equally to both rear axles.
If your vehicle has this
feature, the control is
located at the lower
right corner of the
instrument panel.
NOTICE:
-
Activating the inter axle differential lock when
the rear wheels are actually spinning freely, as
they might on ice or snow, can cause you to lose
control of the vehicle. It can also damage the
axles. Turn on this control only when the wheels
are not spinning freely.
Let up on the accelerator before you turn on your
-
inter axle differential lock. When you turn on this
control, the DIFF LOCK indicator on the instrument
panel cluster will light.
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