My 2009 RAV4 just developed the growl/ whining noise. I took it in right away and they ordered the part(s) without telling me anything about the warranty extension. I called to discuss this and was informed of it. I have not seen any recall letter to date so I wasn't sure what they were doing. I am always on top of this since my Tundra had a frame replacement couple years ago and that was a complete disaster. It took 16 weeks for that to get replaced and the frame kept mysteriously not showing up from week to week. Again, I was told the part for this would be in next week and it did not arrive, now I am being told there is no expected date and not to drive the vehicle much even though they state it is not a safety hazard. Toyota will not provide a loaner or rental and I've had an independent mechanic review it and tell me that it could cause a serious hazard if it fails so don't drive on the highway at high rates of speed. Toyota is banking on the fact that "I haven't seen one fail yet" as told to me by two separate service centers. Two things: what part(s) are being replaced and how do we know if there is not additional damage to the rear diff that may or may not get repaired? Second, could this really be a hazard when driving?