Speedometer Needle Bouncing?

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Mar 2, 2019 | 07:41 AM

#16

GLR

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From: NY and VA

Quote:

Originally Posted by pchelp

The same thing is happening in my 69, Has anyone had any issue with the speedometer eating up the speedometer cables? I every time I pull it out it looks like a mouse nest just behind the dash. I have replaced it twice in two years.

Is there a kit to adapt it to an electronic system?

What shape is the housing in? Is it resting on an exhaust pipe? Is there a sharp bend in the housing? A measurement from the chewed up cable part will give you an idea of where to look.

Mar 2, 2019 | 10:03 PM

#17

pchelp

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Joined: May 2017

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Quote:

Originally Posted by GaryKip

As it has been said before, "Google is your friend" Check out this link:/www.hotrod.com/articles/electric-speedometer-conversion-junkyard-builder/ If not, you could buy and install a cheap GPS. That would show precise speed.

Very interesting article, wish they had used a Ford for the story.

Mar 2, 2019 | 10:06 PM

#18

pchelp

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Quote:

Originally Posted by GLR

What shape is the housing in? Is it resting on an exhaust pipe? Is there a sharp bend in the housing? A measurement from the chewed up cable part will give you an idea of where to look.

I’ll let you know when I put the new cable in, last time I replaced it I really didn't give the speedometer much thought.

Mar 4, 2019 | 07:29 PM

#19

alaricsept

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From: GA

while we're on cable cleanup. Im back on the site with another engine swap question, I am resto-moding a 65 f100, I put in a 351w (from 79), and a c6 (from 77) I am having the tranny worked on now bcs it skips 2nd gear on shifts, (it pulls like a diesel in 3rd though), anyhow... I am having trouble getting my speedo gearing worked out, if I run the calculation it says I need a 12 tooth gear??? lowest I can find is a 16 tooth gear. 3.00 Rear (probably 3.08) normal C6 gearing and 30" tires. Is my calculation right. Speedo is way off. The stock 3 speed was very similar in gearing to the c6, so I thought I wouldn't have to change it but it is way off, am I barking up the wrong tree?

Thanks Big Al

Mar 4, 2019 | 07:45 PM

#20

GLR

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Joined: Sep 2003

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From: NY and VA

Ford Speedometer Gear Calculator
According to this you have to know the # of teeth on the drive gear in the trans . On the C6 I don't think you can change it.
You might have to get into the speedometer head

Mar 7, 2019 | 01:17 PM

#21

alaricsept

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From: GA

Quote:

Originally Posted by GLR

yea, I talked to summit and some other places and they said it should have 6 teeth in the transmission. I think I have it figured out at 18.5 teeth which would either be and 18 or 19 tooth so I bought both and will try them out. It's still in shop for tranny repairs... going on 9 days...

Mar 9, 2019 | 05:38 PM

#22

pchelp

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Quote:

Originally Posted by GLR

What shape is the housing in? Is it resting on an exhaust pipe? Is there a sharp bend in the housing? A measurement from the chewed up cable part will give you an idea of where to look.

Here is what the core looked like after 1,000 miles. I put another new cable on the speedometer and took some videos.