Over drive stays on and do not know how to reset it. Replaced many parts.

Have you had a transmission shop do the diagnosis or were the parts guesses? If your doing your own work , at this point I would strongly recommend buying the factory service manual.NOTICE I did NOT say haynes or chiltons, although they do come in handy for some stuff.FACTORY MANUALS generally have step-by-step trouble shooting guides in them.May be more usefull and cost less than continuing to replace parts.Good luck.

go to aamco for free scan and diag and est