the main differences in Full Time 4WD, AWD, 4WD? I was looking at several different vehicles, to be specific, Subaru, Audi, BMW, Land Rover, there are so many description but the concepts seems the same. I apologize for my lack of knowledge in this field but, I just wanted to clearly understand the differences. As I know, most of the people buy 4WD or AWD vehicle for the traction in winter driving and these days, there are so many vehicles with advanced technologies in improving tractions in severe road condition. Audi's, BMW 325,330XI, Jag X-Type, Benz 4Matic, Infiniti G35X, Subaru, and goes to the SUV category.