Can anyone explain to how my NSS works or does not work. First off the truck will start in any gear. I removed the switch from the steering column. I can get the reverse lights to come on only when I push the switch FIRMLY to the left. Is this correct? It would seem that the truck is in park while the switch is completely compressed. When I release pressure the reverse lights go out. Also the transmission was just rebuilt. And it will jump into reverse if you as much as blow on the shift linkage.

 

There are two NSSs for our trucks. One is mounted low on the column, and the other is mounted on the transmission.

Yours is out of adjustment.

AND I'd go back to the transmission shop and have them correct the linkage they screwed up

 

73-77 have the switch on the column. 78-79 have the switch on the side of the transmission.
On yours, place the transmission in neutral, loosen the two attaching screws and move the switch side to side until you can insert a drill bit, wire or small rod in the gauge hole in the switch. Then tighten switch.

 

Thanks for the diagram, Mike! My 77 is slightly out-of-adjustment, and this looks like just what the Doctor ordered!

 

Careful you will wind up with this...

To adjust the safety neutral switch on the column.
1) Transmission in Neutral (chocked wheels)
2) Gear shift lever in Neutral
3) The switch with the holes lined up (use small drill bit to align it).
Once you have done all this......tighten the switch bolts up.

Also more words from mikeo0o0o0. "When the trucks came with a manual trans, there was a dummy plug used to bypass the NSS switch. I've never been able to come up with a part number for the dummy plug. To bypass the automatic set up: Unplug the switch and discard or ignore. There are four wires in the harness plug, two each, red w/ blue trace and black w/ red trace. Run a jumper between the red/blue and red/blue, do the same for the black/red. That completely bypasses the NSS switch. Your truck will now start and the back-up lights will be permanently on.

Now on to the backup lights.
In the engine compartment is a little U shaped jumper wire. It'll be located on the drivers side splash pan, just in front of the firewall where the wiring harness comes through. Unplug the little jumper, this will shut off the back up lights. There should be a back up light switch on the trans cover. Run two wires from the switch to the two wires that were jumped. This will get your back up lights working again.

Just a note, you could make a jumper plug out of the NSS. Cut the switch off the harness and splice the two pairs of wires. I just hate to cut these switches up. New, they're getting pricey. Here's the little jumper in the engine compartment. EDIT: If you don't care about the back up lights, just jumper the red w/ blue trace wires. This will by pass the NSS but the back up lights won't work.

 

C7TZ-7A247-A .. NSS - Steering Column Mounted (Motorcraft SW-600) / Obsolete ~ Available NOS & from auto parts stores.

1967/77 F100/350.
---------------------
D0TZ-7B097-B (replaced C5TZ-7B097-A & D0TZ-7B097-A) .. NSS Selector Lever / Obsolete

1965/77 F100/350.

This lever snaps onto the shift tube thru a hole in the steering column shroud. It has a knife blade end that inserts into the NSS.

When the knife blade end snaps off, the truck can be started in any gear.

GREEN SALES CO. in Cincinnati OH has 8 = 800-543-4959.

CARPENTER NOS OBSOLETE PARTS in Concord NC has 1,259 = 800-476-9653.

 

Thanks for all the info . The issue with my newly rebuilt transmission. It jumps right into reverse when I start it. The transmission has less than 15 miles on it. The truck is far from road ready. The builder told me when i got it installed to bring the truck back. Is this why? Is there an adjustment at the shift linkage that he needs to make? I've had steering column out. I've installed a new bushing at the column . Ive tried to adjust linkage to prevent it from jumping into reverse. Could my problem be that the linkage in transmission is just not set correctly? With everything unhooked. And me under truck. I can put even the slightest amount of pressure on the linkage and it drops into reverse. Thanks DB

 

hi, I believe I was experiencing a similar issue with my 71 F100 C6. Whenever I would start it in park or neutral it would jump into reverse hard even with the break all the way on or into drive in the same manner. It would make my truck jump but the brakes probably do need replaced. Did you ever figure out why it was doing that or get it fixed possibly and if so how did you fix it? Thank you

 

I remember, we used to hear a lot of stories of this happening with the passenger cars. Don’t remember it so often with the trucks, but apparently it’s still a thing.

It would be good to have the original poster come back with the fix, but it’s been eight years so hopefully they’re still here.
And hopefully they got it fixed!

Good luck with yours. Maybe in the meantime, someone else will chime in with their suggestions.