I HAD BEEN NOTICING THAT THERE WAS A SLIGHT NOISE ON THE RIGHT FRONT END OF MY 2007 AVALANCHE. I CHECKED THE UNDERCARRIAGE AND DIDN'T NOTICE ANYTHING WRONG. I HAD AN OIL CHANGE DONE AND IT CAME W/ A FREE TIRE ROTATION. THE SOUND SEEMED TO BE GONE AFTER THAT , I CAN'T BE SURE. THE TRUCK HAD APPROX. 12,000 MILES ON IT. I WAS GOING TO DROP OFF SOME PAPERS WITH A CUSTOMER ON OCT. 6TH WHEN I HEARD THE NOISE AGAIN. I WAS LOOKING FOR THE CUSTOMER'S TRACTOR THAT WE WERE REPAIRING IN THE FIELD AND WAS SLIGHTLY BOTHERED BY THE SUN SO I PUT ONE OF MY HANDS UP TO BLOCK THE SUN. WHEN I LOOKED BACK AT THE ROAD, I WAS IN THE WRONG LANE. I TRIED TO CORRECT AND THE VEHICLE ACCELERATED ON IT'S OWN! I APPLIED THE BRAKES BUT DIDN"T GET THE SAME RESPONSE AS BEFORE. I ENDED UP IN A CONCRETE DITCH. BY THE WAY, THE AIRBAG DIDN'T DEPLOY AND THE ONSTAR DIDN'T GET HELP THERE EITHER. I TALKED TO GM AND THEY KIND OF JUST BRUSHED IT OFF. I STILL HAVE PHYSICAL AND EMOTIONAL ISSUES BECAUSE OF IT. *TR