2007 GMC Envoy Owner's Manual - Page 468

3. Insert the socket end of the extension (C) on a 45 degree angle downward into the hoist drive shaft hole. It is exposed when the rear gate is open and is just above the rear bumper. Be sure the socket end of the extension (C) connects to the hoist shaft. 4. Turn the wheel wrench counterclockwise to lower the spare tire. Keep turning the wheel wrench until the spare tire can be pulled out from under the vehicle. If the spare tire does not lower to the ground, the secondary latch is engaged causing the tire not to lower. See Secondary Latch System on page 475 for more information. 468