1997 GMC Sonoma Owner's Manual - Page 223

Turn the wing nut counterclockwise and remove the wheel blocks, jack and wheel wrench. Your spare tire is stored underneath the rear of your vehicle. See "Compact Spare Tire" later in this section for more information about the compact spare. Insert the chisel of end the wheel wrench, on an angle, into the hole in the rear bumper. NOTICE: Never remove or restow tire frondtoa stowage a position under the vehicle while the vehicle is supported bya jack. Always tighten the tire fully against the undersideof the vehicle when restowing. Be sure the chisel endof the whee1 wrench connects into the hoistshaft. 5-25