Silverado front end noise

i own a 2007 silverado classic. lately i have noticed a rattle in the front end that you can hear slightly and feel in the steering wheel. first thought was that a shock was loose but could not find anything. after talking to others with the same body style, a couple of them had the same thing going on. no one has an answer for me. thanks for any help

Did anybody mention the “Intermediate Steering Shaft”? It seems to be a common problem on gm full-size trucks.

Google “Intermediate Steering Shaft” for more info

http://www.google.com/search?ie=UTF-8&oe=UTF-8&sourceid=navclient&gfns=1&q=silverado+intermediate+shaft

thanks for the help. i will contact the dealer.