Neutral safety switch

The 3 prong switch worked in the original 70 727 trans.I bought another 727 trans and had it rebuilt.It had a 2 prong.I put my 3 prong in it since the wiring in the car is for a 3 prong.Maybe
i need to change something in the trans that actuates the switch since it had a 2 prong and now has a 3