I plan to have a full write-up or video explaining how this is done. Until then, you can check out this forum post:
http://www.tahoeforum.com/showthread.php?t=2383
They have instructions for pre '03 models and '03+. They are both fairly simple and work great. I've done this on a '00 1/2 Silverado and a '04 3/4 ton Sierra.