Chevrolet 2008 Silverado 1500 Pickup Owner's Manual page 502

Extended Cab
A. Wing Nut
Retaining Tool Kit
B. Tool Kit
5-96
C. Wheel Blocks
D. Jack
E. Knob
For regular cab models, the equipment you will need is
behind the passenger's seat. For extended and crew
cab models, the equipment is on the shelf behind the
passenger's side second row seat.
1. Turn the knob on the jack counterclockwise to
lower the jack head to release the jack from its
holder.
2. Remove the wheel blocks and the wheel block
retainer by turning the wing nut counterclockwise.
3. Remove the wing nut used to retain the storage
bag and tools by turning it counterclockwise.