Unknown switch on transmission

[stink bear]

Trying to post a picture, first time.
Anyway, I have 2 switches on my transmission. I'm pretty sure it's an NP435 but I didn't look at the data tag. It's in a 72 F100 4X4.
Anybody know what the switch on top is for? I found the wire unplugged when I took the floor pan off. I thought it might be a neutral safety but supposedly they don't exist on NP435's.
Brett

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[Calfdemon]

I supposed I should read your entire post before replying.. I did not see the part with the 2 connections. I was replying that the red switch is your reverse lights, which I am sure you already know. I don't have an answer for you on the upper thing. The NP435 that we were dealing with in a buddies truck did not have that. But then, his was not a 4x4, so I do not know if there was a difference.

[phantomtruck68]

That is for Transmission Regulated Spark Control System - 8 Cyl - 360, 390 CID Engine
1972 F100 with 3 or 4 Speed Manual Trans. w/Air Conditioner and Super Cooling. There is a diagram in the tech section here on this sight.

[stink bear]

Thanks!
I'll try to find the diagram.........
Brett

[phantomtruck68]

Here is a link to a video about T.R.S.C system. I hope it helps. http://www.fordification.com/library/ma ... temId=6314