5.2 Magnum swap into 70s-80s truck

HotLines said
What really bums me is why an overdrive would need a separate switch as if this was truly a great transmission no one could do without

the switch shuts off the overdrive for towing, thats its only function, you don't need to have it, but its good if you do and need it. makes it so almost all the older parts (shifter, kickdown) will fit from 902/727 transmissions