2008 GMC Envoy Owner's Manual - Page 378

Removing the Spare Tire and Tools The tools you will be using include the wheel wrench (A), wheel blocks (B), extension(s) (socket end) (C), handle (jack end) (D), and jack (E). To remove the underbody-mounted spare from your vehicle: The jacking equipment needed to remove the spare tire is stored under the rear seat. To release the jack from its holder, turn the knob on the jack counterclockwise to lower the jack head. See Rear Seat Operation on page 1-11 for more information. Notice: If you remove or restow a tire from/to the storage position under the vehicle while it is supported by a jack, you could damage the tire and/or your vehicle. Always remove or restow a tire when the vehicle is on the ground. 5-84