Chevrolet 2009 Silverado Owner's Manual page 507

6. Tilt the tire toward the vehicle with some slack in the
cable to access the tire/wheel retainer. Separate the
retainer from the guide pin by sliding the retainer up
the pin while pressing down on the latch.
Once the retainer is separated from the guide pin,
tilt the retainer and pull it through the center of
the wheel along with the cable and guide latch.
7. Put the spare tire near the flat tire.
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