Why my steerling wheel vibrates? on 2008 Toyota Tundra

My steerling wheel vibrates when I speed up and run 50 mph. I had new tires place on my truck in April 0f 2010, tires balanced at time of purchased and three weeks later. I had my tires rotated,front brakes replaced and resurface rotors and had SSC 90L performed on 6/11/10. My steerling wheel still vibrates.

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1 answer 1 comment
did you have the front end checked for loose parts? have the obvious checked first to see if there is any loosness in the front end.

Roy
I found a cap off one of the screws on the front wheel of the passenger size tire. I am going back to the dealer to have it replace. I can have the dealer check to see if there are any loose parts.