i agree with nipper, your AWD unit is toasted... i do own a H6 and im having the beggining of torque bind... when accelerating i have a slight vibration on 1st and 2nd then 3rd and 4th is good... you'll need the AWD unit serviced ie all new clutches, sol c and must must must check the gears if they are eaten up you'll have to do it as well... DONT EVER TOW A SUBARU LIKE THAT AGAIN UNLESS IT IS ON A FLAT BED