Wandering Speedometer Needle at Highway Speeds
At speeds under about 40mph, my speedometer is stable, but it drifts around at higher speeds, as seen in this video:
https://youtu.be/5TxuNPqF8_g I swapped in another speedometer I had, and it was even worse, but acted basically the same way. It seems like bumps in the road are causing the needle to move around. What can I do to fix this? Do I need to get a new/reproduction speedometer? |
Re: Wandering Speedometer Needle at Highway Speeds
Try lubing the speedo cable. Doesn't cost any thing and it may help.
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Take the cable loose at the transmission and look at the plastic gear head it goes into. It's more than likely worn out. Take it out and buy the same gear put back in it. This is just example picture. Look into the end opisite of the gear that is where the cable goes. It should be nice and square like the cable and fit's pretty tight.:chevy: https://cdn11.bigcommerce.com/s-6y2b...246081.JPG?c=2 |
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That gear looks OK. It could be the end of the cable that goes into the speedometer head also. Are the cable end going to the gear itself. How do they look?:chevy:
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If he doesn't chime in PM TBONE1964. He will be able to talk to possible problems inside the speedometer itself.
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What did you lube the cable with?
Did you pull it apart and clean it inside plus the cable. |
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I clean them out inside and the cable with acetone.
Then use white lithium grease for lube applied sparingly. Make sure the cable is held in place along the lower firewall too. |
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Sheesh, mine always wanders like that and I never really thought anything of it. I guess I have another thing to fix.
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I have used graphite dust to lube the speedo cable, but the most reliable ground speed indicator is a GPS device on the dash.
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I think cable issue is the most likely cause of a bouncing speedometer. I would remove the cable, pull the inner cable out of the sheath and a suitable lubricant (i.e. not lithium grease) such as:
https://www.amazon.com/Ags-Kable-Eas.../dp/B000ZO0EA2 |
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I just put this new cable in and lubed the heck out of it, as did the OP, so I don't think it's the issue here
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How the routing, do you have a sharp bend in the cable. Maybe disassemble the speedometer and lube the part of the cup/magnet part that the cable spins. Maybe it is binding due to hard grease at the housing.
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When I pulled my cable and housing out, Cleaned the inside of the housing and could not believe the grit and gunk that came out of it.
after a couple of good cleanings to the housing and cable, lubed with speedometer cable lube and good as new. |
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I have found those offset spedometer correction boxes [used when you have bigger than stock tires] tend to amplify the bounce.
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I sent my speedometer to TBONE1964 and he ended up replacing the entire speedometer head with good used unit. The speedometer is drastically improved over my old unit. It is rock steady most of the time. It still swings around if I hit a bump or dip, but that seems unavoidable. Here's a video of it in action.
https://youtu.be/Cvvz8rQTz_E |
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My rig just rolled over 400,000.
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