Speedometer Head Scratcher

Discussion in 'Troubleshooting & Diagnosis' started by 5thTimeAround, Oct 8, 2020.

  1. 5thTimeAround

    5thTimeAround New Member

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    Hey there, brand spankin' new member here!

    I have a 1980 Z28 with a 4 Speed T10. Recently had a noisy speedo cable (no surprise there) so I disconnected and lubed with graphite spray. After hooking back up it worked for a couple of days, made some awful noises then stopped working entirely. After a lot of trial and error I ended up replacing the stock 2-piece cable (no cruise) with a 1-piece. When I hook everything up I either get nothing from the speedo, or I get a sticking and sluggish speedo that doesn't return to 0. Strangely enough, if I remove the speedo from the gauge cluster and hook it up by itself it works great. It's almost like having it in the cluster is causing it to bind or else impeding the cable from hooking up properly - although that doesn't appear to be an issue.

    Any thoughts from anyone? Thanks in advance,

    Scott
     
    Last edited: Oct 8, 2020
  2. 5thTimeAround

    5thTimeAround New Member

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    Well, I guess I jumped the gun by an hour or so. I figured it out. Turns out that since my cluster has some busted tabs it was not sitting properly and was likely causing the speedo cable to bind inside the speedo unit. Just moving the bottom of the cluster by a 1/4 inch brought the speedo back to life! So...if anyone encounters a similar issue check to make sure the cluster is aligned properly!
     
  3. COPO

    COPO Veteran Member Lifetime Gold Member

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    I was going to suggest to reroute it.
     
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  4. Gary S

    Gary S Administrator Lifetime Gold Member

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    It is possible that your new cable isn't seating fully into the speedometer when the gauge is in the dash. If it sits at the wrong angle, it might not fully seat and drive the speedometer correctly.
     
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  5. biker

    biker Veteran Member

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    Welcome! I have an 81 Z, cane with a super T10 as well. Just for future reference, I had a bad cable, then a bad speedo gear. Once both were replaced, it was good to go. Cable is an awful job though, unless you are a hobbit.
     
  6. COPO

    COPO Veteran Member Lifetime Gold Member

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    Does it still click in like 70-71’s at the IP?
     
  7. Twisted_Metal

    Twisted_Metal Administrator Staff Member Lifetime Gold Member

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    My speedometer bounced around after a cable replacement and I found that giving it a tug to get it square with the cluster got it working smoothly again.

    Sounds like you encountered the same issue.
     
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  8. 5thTimeAround

    5thTimeAround New Member

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    Yup I did the cable yesterday. Although I’m close to hobbit size so it wasn’t too bad haha
     
  9. 5thTimeAround

    5thTimeAround New Member

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  10. 5thTimeAround

    5thTimeAround New Member

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    Yes it clicks in
     

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