My cars rear end is making a loud grinding noise, it sounds just like very bad worn out brake pads where the pad is gone and the plate is grinding into the rotor (makes me cringe). I have replaced the rear rotors and brake pads although I knew that wasn't it. I have also drained and replaced the rear end lube which by the way made the noise a lot worse. It makes no difference if I'm turning or what speed I am going. Taking off or stopping there are no clunks, it just makes a constant grinding noise. The limited slip is not working now. Has anyone run into this before?