I know for a fact that the rear drive shaft was not diconnected on the car that was towed from Porltand ME to Burlington VT 93 90 Q (Torsen) as I helped unload the car at the time. I had my doubts but so far so good. It is a differential so I can see how it can move ok, but it would seem to be harsh on the unit. However, again ,so far so good. Regards DF