> Changed the diff fluid every 75k. Ehhh, still about my girlfriend's new "used" 91 A90... The car's got 90000 miles, and I don't believe the diff fluid was ever changed. I seem to recall this might be a problem on those cars, but I don't remember for sure. Any clue ? Could that be why the front wheels spin/lock up briefly (?) on downshifting to 1st gear with the auto tranny ? Greg.