I would recommend Lentech street terminator calibration 2 valve body for AOD. It is the best thing you can do for it. I just got my car back with rebuilt trans several weeks ago and I should have done that mod a long time ago. It makes 1 hold 1st, D holds 2nd, OD holds 3, and only shifts to overdrive if the switch is on for it. Or you can set it on OD and car will shift auto. But it gets rid of the early over drive shift that my did on dyno and sometimes on street.