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1979 D100 speedometer

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1979 D100 speedometer

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  #1  
Old 03-20-2018, 05:45 PM
nreuter
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Default 1979 D100 speedometer

Hi there, I know a 79 isnít ďtechnicallyĒ a ram but I wasnít sure where to ask. On my truck, the speedometer has decided to just stop working right. It still sweeps fully, but it chatters really bad/loud above 30mph, bounces around at highway speed, and rests at 10mph when the truck is off and in park. Is this probably a cable, speedometer itself, or something else situation?

Edit: also, it just randomly started all this one day coming down the interstate.
 

Last edited by nreuter; 03-20-2018 at 05:51 PM.
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Old 03-20-2018, 06:26 PM
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I would suspect the drive cable is failing......
 
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Old 03-20-2018, 06:30 PM
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Originally Posted by HeyYou View Post
I would suspect the drive cable is failing......
Failing as replace the entire cable, or clean/lube the cable? Thank you.
 
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Old 03-20-2018, 06:38 PM
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You could try cleaning and lubing first, see if it made any difference.
 
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Old 03-20-2018, 06:40 PM
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Alright, thank you.
 
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Old 03-20-2018, 07:43 PM
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Originally Posted by HeyYou View Post
You could try cleaning and lubing first, see if it made any difference.
I just remembered, (I havenít worked on it yet) the odometer still reads totally accurate. Would you still say drive cable?
 
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Old 03-21-2018, 03:33 PM
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Yep. The speedometer may be bouncing around, but, the odometer moves much slower, so, it *looks* stable..... Taste and see. If the cable looks good, and the lube job doesn't fix it, maybe time to have a hard look at the cluster itself.
 
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Old 03-21-2018, 05:26 PM
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Originally Posted by HeyYou View Post
Yep. The speedometer may be bouncing around, but, the odometer moves much slower, so, it *looks* stable..... Taste and see. If the cable looks good, and the lube job doesn't fix it, maybe time to have a hard look at the cluster itself.
Alright, Iíll mess with that as soon as I can work on it, and hopefully remember to post an update.
 
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Old 03-27-2018, 03:05 PM
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Update: I finally got to work on it today. Took the cable out and cleaned with some pb blaster, then well coated with powdered graphite. That fixed the chattering and jumping around. it still registers ten over, but it does that when itís parked and itís consistently 10-11 over now up to highway speeds at least, so Iím happy with it. Thank you.
 
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Old 03-27-2018, 03:16 PM
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Is the needle out of place on its spindle?? That *may* be fixable.....
 
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