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speedometer erratic

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Old Apr 14, 2022 | 09:57 AM
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Default speedometer erratic

I recently replaced the cable and housing for my 81' and the needle is still erratic and bouncing. Can the speedometer itself be the cause or is there something I have overlooked? It was a relatively simple housing/cable replacement.
Thanks,
PDM
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Old Apr 14, 2022 | 10:18 AM
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I wouldn't think that the speedo itself would be the problem, but anything's possible. If the gears go in the speedo head, it usually doesn't work at all. It sounds more like the cable might be kinked, or have too tight a bend in it someplace. Do you have cruise control, if so, did you replace both cables, or just the lower one?
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Old Apr 14, 2022 | 10:37 AM
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did you grease it? that will screw you up..and cause this
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Old Apr 14, 2022 | 04:21 PM
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Never grease the cable. Use graphite.
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Old Apr 16, 2022 | 08:33 AM
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I used graphite on last one but did not add any to this. will pull it out and do so. If it's not in the speedometer itself then I'm hoping you are correct and the cable has too much bend in it; likely from the firewall down. There is a great deal of 'extra' cable at the bottom. Will try. Thanks.
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Old Apr 16, 2022 | 09:31 AM
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Does the speedometer "stick" on 10-15 mph when sitting still? If it sticks when not moving it isn't the cable cause cable not turning at that point.
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Old Apr 16, 2022 | 10:29 AM
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Originally Posted by Elcransonator
Does the speedometer "stick" on 10-15 mph when sitting still? If it sticks when not moving it isn't the cable cause cable not turning at that point.
Don't think so but will check ASAP. I do know that I can spin the gear by hand at the transmission and the needle jumps. thanks.
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Old Apr 17, 2022 | 12:14 PM
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Do you have a cruise control transducer? You could have an issue with the 2nd cable. It sounds to me like a cable lube issue.
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