I used a 68 Charger 727 when I built my 70 Satellite. I had everything completed mechanically and working. After paint I started to assemble everything. When I hooked up the back-up lights I checked them with the key on in reverse and they worked. Little did I know they were on in d-2-1 also. So what everyone is saying is that since the 68 trans had a rooster comb for a single NSS when I installed the 3 prong NSS I would have had to change the rooster comb to make everything correct?