It sounds like you had a pressure problem or failing pressure control solenoid which was causing the rough shifts and the result of the overly high line pressure may have broke your forward apply band-which is causing your no movement in D, and possibly blew out a channel plate gasket inside the trans which is causing excessive pressure to bleed off. Check out this thread for the forward band breaking problem...
http://www.grandprixforums.net/f21/n...gtp-10967.html
There is likely more to it than that based on what you have mentioned but there is not a lot that can be done in the car and some teardown is going to be required to investigate.
