C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

nut thread size on sunvisor rod ?

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Old Jun 13, 2017 | 01:07 AM
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Default nut thread size on sunvisor rod ?

anybody know it?


wondering what size nut will fit it reliably without jamming a close but not quite thread nut on it.
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Old Jun 13, 2017 | 01:55 AM
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Those are not threads. They are parallel grooves. A push clip goes on the rod and locks into one of the grooves:

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Old Jun 13, 2017 | 11:15 AM
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Default slight difference

Hi Cliff,

thnx. here is my setup.

it appears that the large diameter retainer "washer" is built in to the "push nut" fastner on mine.

i will clean up the rust on these parts before install.




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Old Jun 14, 2017 | 08:07 AM
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It is threaded...5mm X .80 and it takes a 8mm socket.



Chuck M
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Old Jun 14, 2017 | 10:21 AM
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interesting, two different responses. I suspect that the early c4's from the factory they were actually push pins. ( I believe Cliff has an 86, and that is the year I am working on as well. )

Maybe they changed later on in the years?

i did have an 85 that had a nut force threadded onto it.
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Old Jun 14, 2017 | 10:40 AM
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The picture I sent is from a 1989 convertible.

Chuck M
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Old Jun 14, 2017 | 02:13 PM
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Originally Posted by Cliff Harris
Those are not threads. They are parallel grooves. A push clip goes on the rod and locks into one of the grooves:

I have an 86 and that's what I have. Planning on replacing the visors and so far have not been able to get anything under it to pry them loose. I'm thinking I may have to cut them to get the old ones off, unless there's an easier way, which I have yet to find.
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Old Jun 14, 2017 | 03:23 PM
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Originally Posted by hcbph
I have an 86 and that's what I have. Planning on replacing the visors and so far have not been able to get anything under it to pry them loose. I'm thinking I may have to cut them to get the old ones off, unless there's an easier way, which I have yet to find.
If you push in one or maybe two of those tangs with a small screwdriver, you can take that off, then just push the tangs back in place and it will hold the new sunvisor in place (if you haven't bought new pushnut caps). I use a very small socket so it just fits the visor stud and tap in the pushnut with it. Not too far, you want the spring to do it's job. If you break one of the tangs, just buy a small pushnut and put that on top of the cap.

Note...when I install new sunvisors, I always replace the spring and cap-pushnut.

Chuck M

Last edited by hotmotorsports; Jun 14, 2017 at 03:28 PM.
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Old Jun 14, 2017 | 03:48 PM
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I just bought some reproduction sun visors and they are threaded. Originals were pushnuts.
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