It's a clutch that can be, and is designed to be engaged all the time under power. Audi chose to use it as a coupling device. Only programing or a switch could change that quite easily. SJ In a message dated 1/6/2004 9:23:21 AM Central Standard Time, andre at online.ee writes: Curious, what is "fulltime haldex"? Isn't Haldex just a clutch?