2 Sensors on sm465?

[Joe Kitzmiller]

There are 2 sensors on the top flange of my sm465 transmission, 4 speed. One is located horizontially with 2 terminals, and this is the back up switch. The other is positioned vertically with 1 terminal. What is this switch/sensor? Thanks, Joe.

Blazer rebuild in progress: 1973 K5 with 350 HEI, 3:73, 31" tires

 

[newyorkin]

Maybe the nuetral switch.

 

[TruckNutzDude]

Neutral