I don't have the TSB right here, but here's link to your own previous post on this. See the answer I posted there.
http://www.automotiveforums.com/vbul...light=12167310
also see this link
http://www.fullsizechevy.com/forums/...p/t-40010.html
If you do a google search on "12167310" you will find lots of forums that have more info.