05 Silverado steering

I get a knocking noise from the front end when turning left or right and going over bumps.
I was told it was in the steering column.
Easy to fix or a major problem?
:uhoh:

See this thread :
http://www.automotiveforums.com/vbulletin/showthread.php?t=265506

would you also describe it as a creaking noise? my 2004 does that alot