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Cruise control transducer

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Old Sep 24, 2015 | 11:11 AM
  #1  
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Default Cruise control transducer

78 vette. Doesn't hold steady speed
When activated. Can transducer be
Taken apart and adjusted or rebuilt?
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Old Sep 24, 2015 | 12:57 PM
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Originally Posted by wayne1978SAvette
78 vette. Doesn't hold steady speed
When activated. Can transducer be
Taken apart and adjusted or rebuilt?
Vendors have rebuilt units.

I had a speedometer shop rebuild mine.
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Old Sep 24, 2015 | 07:55 PM
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Originally Posted by wayne1978SAvette
78 vette. Doesn't hold steady speed
When activated. Can transducer be
Taken apart and adjusted or rebuilt?
YES...I have done a few..and that is when I opened them up ....the inside was worthy of my time.

Not holding steady speed....can depend on if you are going down a hill or up a hill.. AND if you set it at 50MPH..and it goes to 60MPH..this can be adjusted when it is still in the car..and the same goes if the speed drops from what you set it at.

DUB
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Old Sep 24, 2015 | 09:53 PM
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You can disassemble it, clean it out, re-surface the friction disc and put it back together. I'm sure there are web pages (video/text) that show you how to do this on the internet. Google "1978 GM Cruise Transducer repair" and see what comes up.
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Old Sep 24, 2015 | 10:09 PM
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Default Repairing transducer

Originally Posted by 7T1vette
You can disassemble it, clean it out, re-surface the friction disc and put it back together. I'm sure there are web pages (video/text) that show you how to do this on the internet. Google "1978 GM Cruise Transducer repair" and see what comes up.
Re-surfacing disc? Can do this myself? Like starter solenoid, copper
Disc gets corroded, clean it and good
To go again. Will look for video/text
As you suggested. Thanks!!!!
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Old Sep 25, 2015 | 10:27 AM
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Mine did the same thing. I took it apart and cleaned it up. Worked again for a little while then started acting up again. Finally just replaced it with a re-built unit.

How it looked initially.




Then after buffing with a Dremel buffing wheel and Polishing compound.







This drive was squeeky and not well lubricated so I drilled a small hole to intercept the bushing for lubrication.


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Old Sep 25, 2015 | 03:59 PM
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I just put an electric cruise control on my 79. Works great and uses a "modern" turn lever control switch. It was easy to install thanks to Dakota Digitals help line. I know I know not stock, but almost nothing on the car that works is.
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Old Sep 25, 2015 | 05:43 PM
  #8  
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Originally Posted by Zorro O
I just put an electric cruise control on my 79. Works great and uses a "modern" turn lever control switch. It was easy to install thanks to Dakota Digitals help line. I know I know not stock, but almost nothing on the car that works is.
Thanks for the good pics. Thinking of
Pulling motor this winter to cleanup,
Re-paint, clean firewall act. Would be
A good time and easier to get looked
At or replaced. 90.00 for rebuilt ones.
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Old Mar 19, 2016 | 08:50 PM
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REELAV8R, thanks for the great pix on this thread. I've got mine apart now and am curious if you used any lubrication on the plates after you buffed them, like a dielectric grease. I assume there's an electrical connection between the 2 plates as they rotate against each other... correct?
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Old Mar 19, 2016 | 10:05 PM
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Originally Posted by bobsdaytona
REELAV8R, thanks for the great pix on this thread. I've got mine apart now and am curious if you used any lubrication on the plates after you buffed them, like a dielectric grease. I assume there's an electrical connection between the 2 plates as they rotate against each other... correct?
I did not use any grease. I think it's a friction connection if I remember right. There is a magnet and it sandwiches the copper plate somehow. I don't believe an electrical connection was involved as far as those plates go.
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Old Mar 20, 2016 | 03:54 AM
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You want nothing between the plates. One is supposed to turn the other. When engaging, they are supposed to allow some slippage; but you don't want them to slip when cruise is operating.
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