Chevrolet SUBURBAN 1993 Owner's Manual page 248

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Changing a tire can cause an injury. The vehicle can slip
off
the jack
injured. Find a level place to change your tire. To help prevent the
vehicle from moving:
-
and roll over you or other people. You and they could be badly
1.
Set the parking brake firmly.
2. Put the shift lever in P (Park).
3. Shift a manual transmission to 1 (First) or R (Reverse).
4.
If you have a four-wheel-drive vehicle, be sure the transfer case
5. Turn off the engine.
is in a drive gear-not in N (Neutral).
To be even more certain the vehicle won't move, you can put chocks
at the
front and rear of the tire farthest away from the one being
changed. That would be
the
tire on the other side of the vehicle, at
the opposite end.
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The following steps will tell you how to use the jack and change a tire.
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