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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: May 2014 Posts: 3 New Guy | | New Guy Joined: May 2014 Posts: 3 | My speedometer on my '74 (I know, don't even say it) C60 dump truck isn't reading correctly. I suspect the speedo cable needs to be replaced. I am wondering if a light truck cable will fit a medium truck. It has a five speed in it. Any thoughts? | | | | | Joined: Jul 2011 Posts: 45 'Bolter | | 'Bolter Joined: Jul 2011 Posts: 45 | Is there a problem with the cable?
Check the cog at the end of the cable where it enters the gearbox, is it the correct cog? (might be colour coded).
Have the wheels been changed, that will throw out the speedo if sizes are changed. | | | | | Joined: Mar 2004 Posts: 6,212 'Bolter | | 'Bolter Joined: Mar 2004 Posts: 6,212 | AK Steve, Welcome to the Stovebolt  You said "isn't reading correctly"...what does that mean? Does it work but just isn't accurate or is the needle bouncing or what??? A little more info will help us diagnose the problem. Mike B  | | | | | Joined: May 2014 Posts: 3 New Guy | | New Guy Joined: May 2014 Posts: 3 | The needle bounces around. Sometimes it reads what might be correct, then it reads zero, then it reads less that what makes sense. I suspect the cog is correct as it passed a commercial vehicle inspection not long ago. However, it could be worn. I'm suspicious of the square ends on the speedo cable myself. | | | | | Joined: Mar 2000 Posts: 1,177 Red dot, center of chest ... | | Red dot, center of chest ... Joined: Mar 2000 Posts: 1,177 | AK Steve, it's been my experience that the driven gear is more likely to be the culprit. They're usually made of plastic or phenolic and the cable end tends to wear the square hole enough to round it off. You could pull the cable out and inspect it, but I'll bet you find it's still square. When metal and plastic get together, metal always wins. | | | | | Joined: May 2014 Posts: 3 New Guy | | New Guy Joined: May 2014 Posts: 3 | I'll crawl under there in the next couple days and take a look at the plastic part. I like easy fixes. Hopefully you guys are right. | | |
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