okay so im asking this question for a friend. I dont know a whole lot about the car but its a 4.6 cobra. 5 speed. > 100,000 on the clock. When he decelerates theres a grinding that sounds like its coming from the transmission?? his foot is not on the clutch and it is fully in gear. My father seems to think it is the rear end. He said if there was something wrong it would vibrate the whole drivetrain... so it could sound like it was coming from the tranny. Thanks in advance.