CHEVROLET 1999 Corvette - Manual (Page 247)

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NOTICE:
Spinning your wheels can destroy parts of your
vehicle as well as the tires. If you spin the wheels
too fast while shifting your transmission back
and forth, you can destroy your transmission.
For information about using tire chains on your vehicle,
see “Tire Chains” in the Index.
Rocking Your Vehicle To Get It Out
First, turn your steering wheel left and right. That will
clear the area around your front wheels. You should turn
your TCS System off. (See “Traction Control System”
in the Index.) Then shift back and forth between
REVERSE (R) and a forward gear, spinning the wheels
as little as possible. For a manual transmission, shift
slowly between either FIRST (1) or SECOND (2) and
REVERSE (R), allowing the wheels to stop before
shifting into gear. Release the accelerator pedal while
you shift, and press lightly on the accelerator pedal
when the transmission is in gear. By slowly spinning
your wheels in the forward and reverse directions, you
will cause a rocking motion that may free your vehicle.
If that doesn’t get you out after a few tries, you may
need to be towed out. If you do need to be towed out,
see “Towing Your Vehicle” in the Index.