I WAS TRAVELING 50 TO 55 MPH MY VEHICLE VEERED TO THE LEFT OUT OF CONTROL. I ATTEMPTED CORRECTIVE STEERING WITH NO RESPONSE FROM THE STEERING. I HIT THE GUARDRAIL DIRECT WITH THE FRONT OF THE VEHICLE CAUSING SUBSTANTIAL DAMAGE. ON 1/2/2014 I WENT AND LOOKED AT MY TRUCK AND NOTICED THAT PART OF THE STEERING KNUCKLE WAS BROKE OFF FROM THE CENTER OF THE HOLE FOR THE TIE ROD AND MISSING. THE TIE ROD SHAFT WAS NOT BENT INDICATING THE STEERING KNUCKLE MAY HAVE FAILED. *TR