i found my noise
This drove me nuts for years. Finally I, after many aftermarket steering shaft parts, yanked the column out and found the culprit. It was in the base of the column assembly where the shaft exits the assembly. The problem was the bearing that supports the shaft is a cheesy POS plastic deal that was broken. It is a tapered setup that is supposed to stay preloaded by the spring that you can see in the engine bay at the end of the column. I threw the POS assembly away and replaced it with a homemade bearing block fashioned from a piece of brown delrin.
I drilled a hole to fit the shaft, rough sized the outside with a belt sander and drove in into the metal housing with a hammer and locked it with a sheetmetal screw. It has been clunk free ever since.
As a side note, I had two borgeson shafts in the truck and I thought they were bad. They were not bad. they did make the clunking worse because the sliding joint was so tight it would easily aggravate the busted bearing retainer.
Let me know if this fixes anyones problem. The plastic thing is so lame I can't believe it only broke for me.