I have a 1994 toyota corolla , I have never done anything with the transmission, ever... Should I do anything with the transmission at this pint. It has 300.000 miles on it??? Scared to death have heard horror stories about doing it?? And some shops wont even go there... I have owned the car since 1994 and have changed oil faithfully , runs ok for its age but can tell tranny is not happy... Ronda williams