Without a detailed examination of different differentials and how different cars employ them, stupid remarks like "This is why, without a form of traction control, an AWD vehicle is useless in any condition other than dry pavement." shows up just how little the author knows.

And anyone who knows anything about cars can tell you the drive train is only about 20% in the handling/traction equation. Tires (tyres) contribute 50% of the cars ability and suspension 25%. The remaining 5% comes from everything else.