It appears my truck has an FMX transmission; the engine and transmission came out of a 1973 Mercury Cougar (351c 2 barrel). From what I am finding, the neutral safety switch is part of the transmission on C4 and C6 tranny's but is always part of the shifter housing on vehicles equipped with an FMX.

I have an aftermarket floor shifter with no provision for a neutral safety switch, does anyone have a suggestion?

 

I am not positive but you may not need it. I do not use one with my converted C6 from 3spd. The only difference is my truck will crank regardless of the selector position. I know it and it is not an issue.

I am not advocating that it is the way to go, only that it can be operated without one.



John

 

Right, my truck will crank in any position. That doesn't bother me, but I would like the reverse lights to work, and I believe I will need them to work to pass the safety inspection. I might just wire them up to a dashboard mounted switch, but Murphy's Law says if I do that I'll wind up forgetting one day and driving 40 miles with the backup lights on, lol.

 

OK, scratching head, what does the N Saftey, have to do with backup lites?

You can ask if backup lites are required to pass before getting inspection. You can mount a switch with a light on it so you will know when it's being used.



John

 

On most transmissions the neutral safety switch includes 4 wires, 2 that are connected when the transmission is in P or N (wire that to the switch going to the starter) and 2 that are connected when the transmission is in R (wire that to the backup lights). So it's all one switch.

 

I know what it is, just didn't put the two together.








John