my 1970 roadrunner has an automatic transmission. it kicks down from 3rd gear to 2nd gear and 1st gear if i tromp on it all the way to the floor. should it be this way i ask>???????. i would like it to shift from 3rd to 2nd gear at about 3/4 throttle. and 3rd to 1st when it is tromped to the floor. how do i accomplish this task?? i know where the kickdown linkage is .....so take it from there...ready,,,,,,,,,,,set,,,,,,,,,,go...im ready to learn !