My girls Outback has a strange shaking sensation through the steering wheel. Does not vibrate fast but rather a dull shake. She said she felt the whole car vibrating coming down out of the mountains (which may have messed up the steering causing the dull shake). I'm thinking the rotors are the culprit, but I'm not sure (not exactly a car mech ). We thought it was the new tires at first but had the re-balanced with no luck. Any other ideas