Broken speedometer cable - Chevelle Tech
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post #1 of 12 (permalink) Old Jul 23rd, 19, 2:07 PM Thread Starter
 
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Broken speedometer cable

I have a 1970 Chevelle SS with a Muncie M21 in it. When I got it the speedometer was not working. I took the dash out and replaced the cable, I also ordered the correct tooth for the tranny. I have 3.73 gears and accordion to the formula calculator it said I needed a 23 tooth. Installed everything and took it for a drive. The speedo worked for 10 minutes or so and then stopped. It was way off on the mph. I got home and took the cable out of the tranny and looks to be broken free from the windings on the cable. I don’t know what to do next to remedy the situation. I’m not sure if there is something bad in the speedometer cluster. Any suggestions?
Here is a pic of the cable off the tranny. Thanks
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post #2 of 12 (permalink) Old Jul 23rd, 19, 2:39 PM
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Re: Broken speedometer cable

did the new cable spin freely before install and was it lubed ? Dash unit should spin freely also

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post #3 of 12 (permalink) Old Jul 23rd, 19, 2:50 PM
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Re: Broken speedometer cable

If you reused the old speedo cable housing, I'd say it's time to replace both the housing and the cable.

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post #4 of 12 (permalink) Old Jul 23rd, 19, 2:55 PM Thread Starter
 
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Re: Broken speedometer cable

It was a brand new cable from goodmark. Original speedo in cluster. I didnít lube new cable up, it spun very smooth. I could move the speedometer by hand when I took the old cable out. It was working for a minute then stopped. Not sure what jacked up the cable like that.
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post #5 of 12 (permalink) Old Jul 23rd, 19, 4:58 PM
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Re: Broken speedometer cable

Are there any really tight bends in the cable installation. It may have been in a bind, or just a defective cable.

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post #6 of 12 (permalink) Old Jul 23rd, 19, 6:21 PM Thread Starter
 
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Re: Broken speedometer cable

Followed the factory routing of the cable, used the factory clip holders on the body.
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post #7 of 12 (permalink) Old Jul 23rd, 19, 7:09 PM
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Re: Broken speedometer cable

Buy a cable from NAPA their quality is much better. I would also remove the gear you just put in and see if that got chewed up that's a awful lot of teeth on the speedometer gear. Make sure you lube the cable too.

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post #8 of 12 (permalink) Old Jul 23rd, 19, 10:15 PM Thread Starter
 
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Re: Broken speedometer cable

Quote:
Originally Posted by HKalin View Post
Buy a cable from NAPA their quality is much better. I would also remove the gear you just put in and see if that got chewed up that's a awful lot of teeth on the speedometer gear. Make sure you lube the cable too.
i did remove it and inspect it, it is fine. i just put the gear that the gear calculator told me to get. i measured tire hight by rear end gear ration and the other part in the tail housing. i pulled a 19 out of there originally.
I will call napa, but itsnt everything they sell from china?
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post #9 of 12 (permalink) Old Jul 23rd, 19, 10:45 PM
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Re: Broken speedometer cable

When you get the new cable, pull it out from the sheathing and drip oil in one end of the sheathing held up in the air, the other end on the floor. When oil comes out the floor end, stick it back in.

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post #10 of 12 (permalink) Old Jul 24th, 19, 1:07 AM
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Re: Broken speedometer cable

You need to use a dry lubricant specifically for cables. Oil attracts dirt and any contaminant will wipe a cable out.

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post #11 of 12 (permalink) Old Jul 24th, 19, 1:21 AM
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Re: Broken speedometer cable

Usually, the cable has to be removed from the speedometer end. Something is not right if you are removing it from the transmission end.

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Last edited by LevonH; Jul 24th, 19 at 7:06 PM.
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post #12 of 12 (permalink) Old Jul 24th, 19, 3:01 AM
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Re: Broken speedometer cable

Quote:
Originally Posted by cl1970ss View Post
i did remove it and inspect it, it is fine. i just put the gear that the gear calculator told me to get. i measured tire hight by rear end gear ration and the other part in the tail housing. i pulled a 19 out of there originally.
I will call napa, but itsnt everything they sell from china?
I bought one from Advance Auto Parts and it lasted about 250 miles. It broke right at the end of the fitting where the casing started. Bought another one from Napa and you could see the quality was better especially on the fittings. That one lasted about 1200 miles but the speedometer stem that came out of the gauge broke off but the cable was still good. I ended up going with a GPS speedometer and eliminated the cable altogether. Sometimes the new cable will come with a little tube of lube in the box.

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