2005 GMC Envoy Owner's Manual - Page 400

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). Envoy XL/Envoy XL Denali 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 1-9 for more information. The following instructions explain how to remove the underbody-mounted spare from underneath your vehicle. Notice: If you remove or restow a tire from/to the storage position under the vehicle when 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. 5-68