2004 GMC Sierra 1500 Pickup Owner's Manual - Page 109

To remove the tailgate, do the following: 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. 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. Reverse the above procedure to reinstall. Make sure the tailgate is secure. 2-15