It's been a long time since i've had a GM column apart, but I know the pivot pins (#35 on the diagram) would occasionally work loose causing a similar problem, you might check them if you haven't already done so. Hope this helps.
Tim
Hello, I'm new to the site & that is my truck. Thanks for the kudos! It always helps. As for plans, the truck is a combination test mule and will also be on display at the 2008 SEMA show showing off some new products we are coming out with, which does include our air suspension lifts. The...