I PURCHASED A NEW 2004 FORD F-150 SUPERCREW. THE REAR DIFFERENTIAL MADE A "WHINING" SOUND BETWEEN 45-50 MILES PER HOUR FROM THE DAY I PURCHASED THE TRUCK. MY TRUCK NOW HAS 7000 MILES ON IT AND THE WHINE HAS BECOME EXTREMELY NOISY AND NOW MAKES THE WHINE FROM 45 MPH TO 70MPH AND ABOVE. MY FORD DEALER WILL NOT MAKE ANY REPAIRS ON THE TRUCK BECASUE THEY ARE TOLD THAT FORD MOTOR COMPANY IS "INVESTIGATING THE PROBLEM" . FORD MOTOR COMPANY HAS BEEN INVESTIGATING THIS "PROBLEM" SINCE 07-04. IT IS NOT 01-05 WITH NO PROGRESS TO THIS PROBLEM AND IT HAS BECOME SO SEVERE THAT I GET HEADACHES JUST FROM COMMUTING EVERY DAY LISTENING TO THE CONSTANT "WHINE" SOUND. THERE NEEDS TO BE A RECALL OR SOMETHING TO MAKE FORD FIX HIS PROBLEM AS I CAN'T EVEN SELL MY TRUCK AS NO ONE WOULD EVEN CONSIDER OWNING IT.*AK