PURCHASED 2012 GMC TERRAIN IN JUNE 2012. SHORTLY AFTER PURCHASE I NOTICED THE STEERING IS VERY STIFF AND MAKES GRINDING SOUND WHEN TURNING STEERING WHEEL. HAD TO DEALER SINCE AND THEY SAID IT WAS DUE TO THE TIRES PRESSURE. THEY SAID THEY PUT IN CORRECT TIRE PRESSURE AND SAID IT SHOULD CORRECT PROBLEM. IT DIDN'T SO I TOOK BACK TO DEALER AND THEY TEST DROVE IT AND SAID THEY NOTICED ALSO HOW STIFF THE STEERING IS. WAS TOLD THAT OTHER MODELS SAME YEAR AND MODE STEERING WERE STIFF. DID NOTHING AT THAT TIME AND TOLD TO KEEP DRIVING AND SEE IF IT CORRECTS ITSELF. IT HASN'T. WHAT CAN I DO TO GET THOSE PROBLEMS RESOLVED? *TR