Is it possible to put an overdrive transmission in a 1987 300 SDL? I just put a new (used) engine in it and my father-in-law has loves the car and wants it. He asked me, like I would know, if we could put overdrive tranny in it. Any thoughts or ideas? Also how do I know if the turbo is working? I did not have any problems with anything in the car until wifey ran it hot and you guys know the the rest.

Thanks for any help.