Sounds like the tranny is shot. Did you pull codes? They really don't open these things up and rebuild them. If this is the original tranny on your 93' then I would say that you were extremely luck to get this many miles on it. I believe that the 93's are well known for tranny failure. Volvo sells rebuilds, but I don't think Indy shops like to touch them. I have read lot's of advice against getting a used tranny, but I guess it depends on how long you want to keep the car.