Merry Christmas everyone, I havent had the quattro long and bought it for the extra traction at this time of year, Like many i couldnt resist lighting up all four wheels on a snowy car park near me, After spinning the wheels and letting off the throttle, The rear drivetrain seems to lock up as if the handbrake is on for a couple of seconds then free itself, if i press the throttle when its tight (after the initial spin) it will stay tight until i come to almost a stop then it will be free, Now i know it will either be the abs or the rear diff, How can i solve this problem> I also get the abs feeling at the pedal at very low speeds and the abs light comes on sometimes and goes off on its own, but i cant help feeling its the diff as it only happens after a full on 4wd spin and its definitely the rear, (i cant tell if its one sided or both, I dont really want to keep doing it in case something happens. Look forward to your replys people. Many thanks. Nicky. P's The abs light does not come on when this problem happens.