I'm many people have asked this same question. Start by saying I’m new to the forum. With a 2008 Sport Trac. 4x2 V6 5 speed automatic. I’ve been hearing a noise that seems to be from the left rear. Read many post about wheel bearing issues. It’s making a Rrrrrr Rrrrr noise and when I turn to the left it stops also seems a little worse turning to the right? I’m sure it’s not from the front wheels. But I could be wrong .Thanks very much .