I've recently purchased a 2011 Ford Edge Limited AWD and the car itself i really like, but, the AWD is really acting strange. My parents own a 2012 MKX AWD and it goes through snow and ice with no issues. The Edge, on the other hand seems to be really squirrely. When I purchased it, I drove it on dry ground and it handled and drove great. When I drive it on roads that are the least bit slick, the back end feels like it is going to go around on me. I have tried turning traction control off, and it didn't seem to make that much of a difference. When I purchased it, the tires on front were newer than the ones on the rear, so, I thought that was the issue, so I replaced all 4 with new. Thought problem was fixed, until this morning. I was able to drive a whopping 30mph before things went crazy. I've driven rear wheel drive vehicles (trucks and Mustangs) for 40 years, but, this is kind of insane. Any help would be greatly appreciated.