............The tranny u got is from a 68 or earlier with a 1 wire neutral safety switch.......u put in a 3 wire nss ......the old style linkage inside the tranny does not have the the plastic rooster comb on it.....so what happens is that the switch is grounding out in both foreward and reverse putting on the reverse lights..........u need to put in 69 up linkage into that tranny.....u can use the linkage out of ur 70 tranny.........kim....