:-\ 4wd, 4x4, or FWD are terms used to describe a vehicle in which all for wheels can powerd, either part time or full time. AWD means all wheels are powered all the time, be it 90/10 or 50/50, all whells recive power from the engine be it an open diff lockable or not, or limited slip type. In some later model Jeeps they a NV-242 transfer case in which 2 wheel drive, full time 4 wheel drive, or 4 wheel drive HI, LO can be selected. I believe it is called by Jeep comand trak. They ar called 4 wheel drives.