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| 84 automatic trans no reverse lights (Page 1/4) |
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flexxmi
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AUG 24, 04:31 PM
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Hey everybody -
2.5 iron duke. When I shift into reverse from park the backup lights come on only momentarily and shut off when the shifter is in reverse. I've installed a new switch on the trans, toyed with the adjustment, but the issue still persists. Not sure how long this has been going on, but is there a second switch on the shifter under the console that may need to be adjusted/replaced or is something else amiss? Hoping I don't need trans work, as I just had a rebuild about 4k miles ago.
Wiring has been checked and is working properly .. just seems like something is out of adjustment.
Thanks in advance.
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Still crazy after all these years...[This message has been edited by flexxmi (edited 08-24-2024).]
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olejoedad
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AUG 24, 06:05 PM
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From your description, I have to assume you have an 84 4 speed.
The 4 speeds are the only transmission that has a shifter mounted switch.
The original switch is easily rebuildable, it's very simple inside.
It's also adjustable via the screw on the end of the plunger.
There is no other switch in the circuit.
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cartercarbaficionado
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AUG 24, 09:24 PM
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| quote | Originally posted by flexxmi:
Hey everybody -
2.5 iron duke. When I shift into reverse from park the backup lights come on only momentarily and shut off when the shifter is in reverse. I've installed a new switch on the trans, toyed with the adjustment, but the issue still persists. Not sure how long this has been going on, but is there a second switch on the shifter under the console that may need to be adjusted/replaced or is something else amiss? Hoping I don't need trans work, as I just had a rebuild about 4k miles ago.
Wiring has been checked and is working properly .. just seems like something is out of adjustment.
Thanks in advance.
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if it's truly an automatic please replace the shift indicator on the transmission. i know youve done it already butthey get very funky over time and build up conducive dust inside
plus new doesn't mean good anymore unfortunately. another check is to unplug it entirely and shift through the gears and see if it behaves different
(also called a safety switch? it's the big black box on the shift shaft)[This message has been edited by cartercarbaficionado (edited 08-24-2024).]
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flexxmi
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AUG 24, 09:39 PM
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I can get the backup lights to light up for a hot second as I'm shifting from Park to Reverse, and the lights come on as soon as I start pulling the shifter down from park to slip it into reverse. The transmission isn't even engaged into reverse at the point when the lights will come on.
Is that just an adjustment with the plunger screw you mentioned? I don't want to mess it up, so I'd like to feel a bit more confident about toying with it before I attempt to correct it.
Thanks Joe!
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flexxmi
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AUG 24, 09:44 PM
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| quote | Originally posted by cartercarbaficionado:
if it's truly an automatic please replace the shift indicator on the transmission. i know youve done it already butthey get very funky over time and build up conducive dust inside
plus new doesn't mean good anymore unfortunately. another check is to unplug it entirely and shift through the gears and see if it behaves different
(also called a safety switch? it's the big black box on the shift shaft)
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The switch on the exterior of the transmission was just replaced yesterday, and yes, it's an automatic trans.
The lights will illuminate briefly as I am shifting from park to reverse and before the transmission engages into reverse.
It just seems like something needs to be adjusted.[This message has been edited by flexxmi (edited 08-24-2024).]
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olejoedad
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AUG 24, 10:20 PM
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| quote | Originally posted by flexxmi:
I can get the backup lights to light up for a hot second as I'm shifting from Park to Reverse, and the lights come on as soon as I start pulling the shifter down from park to slip it into reverse. The transmission isn't even engaged into reverse at the point when the lights will come on.
Is that just an adjustment with the plunger screw you mentioned? I don't want to mess it up, so I'd like to feel a bit more confident about toying with it before I attempt to correct it.
Thanks Joe! |
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OK, I didn't catch that the thread title had that it was an automatic. My bad, sorry!
The revers light switch on an automatic is on the transmission, and incorporated into the Neutral Safety Switch.
The NSS is located on the transmission, and surrounds the shaft that the shift arm in mounted to.
It is held in position by two bolts.
To adjust the NSS, simply loosen the bolts a bit so that the NSS can be rotated around the shaft.
With the key ON, and the transmission in reverse (one detent back from PARK), rotate the NSS slightly until the backup lights come ON. Tighten the bolts.
When properly adjusted, the car will start in PARK and NEUTRAL, and the backup lights will come on in REVERSE.
Don't pay too much attention to the PNRD21 markings on the shifter surround.
They aren't all that accurate for the most part.
Sorry for the confusion in my first response, as I mentioned above, I didn't read that it was an 84 automatic.
And keep us posted as to your success or failure, we are all glad to help out!
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cartercarbaficionado
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AUG 25, 01:58 AM
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| quote | Originally posted by flexxmi:
The switch on the exterior of the transmission was just replaced yesterday, and yes, it's an automatic trans.
The lights will illuminate briefly as I am shifting from park to reverse and before the transmission engages into reverse.
It just seems like something needs to be adjusted.
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the shift shaft may be different than its intended use. ita happened to me on a few 4t60 and 4l60e vehicles at this point. which keyway style is this switch?
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flexxmi
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AUG 25, 12:05 PM
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After loosening the two nuts indicated by the arrows I am able to engage the backup lights by moving the lever, however, when the lights are on the switch is not in a 'natural' position - meaning that when I move the lever it clicks and drops into what must be a slotted mechanism within the switch and when the backup lights are engaged it is not in one of the slots but in between the slots.
The other issue is, when I thought I had it figured out, the bolt on the cable was extended to the very outer area of the adjustment slot and I had a difficult time getting it through the slot and when I did it popped back to the slot inside of the switch and the lights went out.
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flexxmi
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AUG 25, 12:06 PM
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flexxmi
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AUG 25, 12:07 PM
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