So i noticed that my car had been making awful grinding sounds when I turn or reverse. I wasn't sure what It was so I took it to the mechanic.The mechanic informed me that there might be a problem with my rear differential. I decided that I wanted a second opinion so I will be taking my car to a certified pontiac dealer and see if they can diagnose the problem. Has anyone else experienced this problem? and if turns out to be that problem how much should i be expecting to pay for the repair ? By the way i drive a 2007 solstice and its no longer under warranty .... And does anyone know what this real axle pinion recall is about ?