GMC 2007 Sierra 1500 Pickup Owner's Manual page 128

Tailgate Removal
The tailgate on your vehicle can be removed to
allow for different loading situations. Although the
tailgate can be removed without assistance,
you may want someone to assist you with the
removal to avoid possible damage to the vehicle.
To remove the tailgate, do the following:
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1. Raise the tailgate
slightly and release
both retaining
cable clips. To
release the retaining
cable clips, lift the
cable so it points
straight out
and push the cable
clip forward.
Reverse the above procedure to reinstall. Make
sure the tailgate is secure.
2. With the tailgate at a
slight upward angle,
pull back on the
tailgate at the right
edge and then
move the tailgate to
the right to release
the left edge.