Clean Your Neutral Safety Switch A442F

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Sep 17, 2017
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Hi guys, I thought I would post a few pictures of my NSS cleaning that I did.

Symptoms I was having before doing this:
No reverse lights on both the dash and out back.
Slipping in hard reverse.
Long time for the trans to go into reverse.
Occasional no start in park.

All of these problems are now gone 100%

The photos you see are actually from my backup sensor that i bulled off my old blown transmission. The primary sensor I am now using I never took off go the car. I only loosened it in place. My advice is to just do this under the car so you don't have to bother with unplugging the thing. The plug on the A442F is way up by the top of the bell housing. If you have a 95+ I thing the plug is on the actual switch but I am not familiar. I would not be surprised if it cleans the same way. 2x 12MM bolts and one 22MM nut keep the sensor on the vehicle. The 22MM nut has a retaining washer with ears that need to be flattened to loosen the nut. The sense can actually be adjusted by just loosening the 12MM bolts but I will say this: if your shift linkage is adjusted properly than you should not really have to "adjust" the angle of the switch. It should be for the most part centered. I cleaned with brake clean and a pick to get all of the old goo out of it. I polished with 400 grit, and relubed with white lithium.

Pictures:
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Joined
Apr 14, 2016
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I did this under my 94. It's a pretty easy job, but there are tiny black springs under the contacts that are extremely easy to lose. If I were doing it again, I think I'd put down a large piece of cardboard for contrast and maybe an old towel to reduce the chance of them bouncing away if they pop out.
 
Joined
Feb 23, 2011
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40
How did you guys manage to get that little metal round thing that sits in the other end of the breather tube(?) out of the plastic wire wrap surrounding the wire harness? Mine is stuck in there and I can't get it out to reattach it to the tube for the life of me. There doesn't seem to be enough clearance for it to come out of the tube because of the wires being in the way.

What is that thing, anyway? Is it necessary?
 
Joined
Feb 23, 2011
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40
Scratch that - I eventually managed to wiggle it loose with some very small needle nose. Once I reassembled everything, I can now start the car in neutral, but not in park... so I guess my issue is half-solved? Do you happen to know which of the two copper wipers is the one that affects the starting circuit?
 

Tedward

95 LC
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Feb 2, 2015
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Cleveland OH
Have you adjusted it by clocking the switch?
Move it one way or the other then try to start it.
 
Joined
Feb 23, 2011
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That did it! Moved it the other direction and cranked the bolts back down, and now it starts right up. Awesome. No more starting the cruiser with a jumper wire to the starter solenoid. Thanks!
 
Joined
Dec 1, 2018
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Thousand Oaks, CA
i have a 94 and my backup lights don't work as well and when i backup it slips out of gear. How hard is it to unplug the wires reattach after cleaning the neutral safety switch? it looks like they are located somewhere up the transmission.
 
Joined
Oct 10, 2017
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Morgan Hill Ca.
This write-up saved me a bunch of time, I have a couple of tips to add.
1. Clean and mark the NSS location with a razor blade before removing it ( make a mark on the side of the case) you won't have to adjust it when you reinstall it.
2 . You don't need to sand down the contacts, as you can see in your pictures only the top contact has grooves and they are offset, just flip the top contact over and you have new untouched contact material. You also don't want the contact to be sanded flat, if you look closely they are curved so they can slide smoothly on the uneven contact surface of the NSS. Thanks again!
 
Joined
Sep 15, 2021
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84
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Colorado
bumping this up as the other thread about NSS issues causing dash light issues has me thinking I need to do this.
 
Joined
Aug 10, 2015
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PNW
bumping this up as the other thread about NSS issues causing dash light issues has me thinking I need to do this.
Yeah, that's my fault. :p I'm going through all the lights in the dash and the only ones that are giving me issues is this and the key switch light. Of course fixing them isn't as simple as replacing a bulb. :bang:
 
Joined
Jun 14, 2021
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Location
Fayetteville, NC
I'm about to try this tomorrow. As of right now, I have no reverse lights on both sides, hard shift from park to reverse or drive to reverse, and I'm not sure about the R light on the dash. I want to say its working.... Does that mean my diagnosis is off?
 
Joined
Sep 15, 2021
Messages
84
Location
Colorado
I'm about to try this tomorrow. As of right now, I have no reverse lights on both sides, hard shift from park to reverse or drive to reverse, and I'm not sure about the R light on the dash. I want to say its working.... Does that mean my diagnosis is off?
Just a heads up. I installed a brand new NSS...and it did nothing for my symptoms. I still don't have reverse and my shift to reverse from park is still harsh.

When I installed the new NSS wire harness I had corrosion in the connection because the PHH leaks right onto that connection which turns the wires a nice shade of green.

Open that connection first before you invest in a NSS. That may be your problem.
 

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