AFTER TRAVELING 160 MILES AND EXITING THE FREEWAY THE POWER STEERING WAS INOPERABLE STOPPED TO CHECK FLUID WAS FULL. STEERING IS FINE AS LONG AS THE CAR IS ABOVE 20 MPH. STOPPED AT SMALL TOWN SHOP, MECHANIC INFORMED ME THAT THIS IS NOTHING NEW WITH THIS CAR. AND THAT GMC HAS PLENTY OF CHANGES WHEN REPLACING THE SYSTEM BOTH PUMP AND RACK AS WELL AS DIFFERENT FLUID BUT WOULD NOT HELP ME WITH ANY COST. FOR WHAT IS WORTH THE NHTSA KNOWS ALL ABOUT THIS PROBLEM WOULD NOT HOLD MY BREATH ON THEM DOING ANYTHING ABOUT THE PROBLEM UNTIL THIS CAR IS FULLY LOADED WITH EIGHT PEOPLE AND THEY ALL ARE KILLED THEN THEY WILL WAKE UP! *TR