Steering noise

I'm a noob here.  I have an 04 Impala SS that knocks when turning left and right.  CV boots are fine.  I tried doing a search and didn't really find anything.  Can anyone help please?

  More than likely it's the intermediate steering shaft, needs to be greased. It's down by
your feet. Kind of a light popping noise when you turn, kind of like cracking your knuckles.

That sounds about right.  I called my Chevy store and the service dept said there is a lube kit for it.  But when I talked to the parts dept they said the lube kit is discontinued and I would have to buy the shaft.  But since I too am a dealer, I'll get it at a discounted price.  $87.25.  Does this sound right?  Parts said this new shaft has all the bugs worked out of it.. supposedly.
I'm crossing my fingers.

there is a real easy fix using lithium grease, the link is below

http://www.naioa.com/v2/modules.php?name=Forums&file=viewtopic&t=10805&highlight=iss+lube

Thanks zvm77!  I'll get this done sometime when I have time.

  That's what i do myself, also. Every couple of oil changes, i have someone turn the steering
wheel side to side while i spray grease on the knuckle. Next time i'm going to try
John Deere chain and cable lubricant. It foams up when sprayed, and then soaks deep into
everything. I think it might work better.