ODdave there are several ways to have overdrive and lock up work. First off the first three gears are all hydraulic just like the turbo 400, overdrive and lockup are controlled electric over hydraulic. A two way hydraulic switch can be put into the governor port that is set too go off at about 50 psi (one psi per one mile per hour increase), with an electric switch on it too trip overdrive and lockup, and then have it set to release at around 45 psi to unlock torque converter and overdrive. Also could put a relay on the brake switch to disengage lockup when the brake is pressed, makes stopping a little easier, I have the brake switch relay setup on my 700r4. Like mentioned earlier could also just put two switches in the cab for the lockup and overdrive.