I have a 2006 forester which does the same thing every time I drive it
Each day the first time I am driving out of my garage and down the street
the car gives a loud thunk as it shifts (Automatic tranny). It is louder and
more prunounced in cold weather. I have read on other blogs that other
people have experienced the same thing. One person said if was the ABS
automatic check but I don't know that I agree as it is a shitfing/transmission
thing.