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My trans guy set me up with a semi-manual valve body, so i will be using a B&M shifter, basically he said that all the magic when in "D" is happening inside the trans, so i think he has it based on line pressure, not sure exactly what he is doing in there, but i have to hook up a 12V power source, and a ground wire to be controlled via the PCM for speeds over 50mph when in "D" ( i think its to lock the converter up).
Hes a local guy that makes all the transmissions for the Core racing trucks and drag cars in the area.