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EFV-8 Club Forum / General Ford Discussion / speedometer off slow 6-7 MPH

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flatfoot

08-06-2024 @ 8:56 AM

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I'm in Redding, CA. trying find a shop that will fix my original speedometer. It reads 35 mph and I'm going 40-41 mph. I am trying to locate a shop in this area that will calibrate and fix the speedo. Anybody have any ideas where I might find a shop willing to work on it? I would appreciate any and all suggestions.

Thank you.

08-06-2024 @ 9:00 AM

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Is it that you have installed different from stock wheels and tires?...

51504bat

08-06-2024 @ 9:02 AM

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Not local but Rusty at Speedometer Service in Colorado repaired the SW speedometer in my '39 p/u. dead nuts on according to my dash cam display. Fair price and fast turn around.
https://www.speedoservice.com/

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kubes40

08-06-2024 @ 9:23 AM

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I'm with MG on this. Prior to calibrating the speedometer, you need to figure out the diameter of the rear tires and then check to be certain whether or not you have the correct speedometer driven gear installed respective of the tires.

Mike "Kube" Kubarth

carcrazy

08-06-2024 @ 10:22 AM

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What year and type of vehicle do you have? We might be able to determine what driven gear you need to get your speedometer to read more accurately. From your description, it looks like your speedometer is reading about 85% of the speed the vehicle is travelling.

juergen

08-08-2024 @ 5:40 AM

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I agree with carcrazy. You should try the next lower gear count on the speedo driven gear. That should make the cable spin faster.

flatfoot

08-08-2024 @ 10:00 AM

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No. Tires and wheels are original tire size and wheels are factory.

flatfoot

08-08-2024 @ 10:01 AM

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Tires and wheels are stock from factory.

flatfoot

08-08-2024 @ 10:03 AM

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I have a 1936 Ford Sedan 4dr. It has everything stock except the transmission is 1939 Ford.

CharlieStephens

08-08-2024 @ 6:04 PM

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Check the odometer over a measured mile. If it is off by the same amount you probably have the wrong drive gear (the one that attaches to the torque tube) for the speedometer.

Charlie Stephens

This message was edited by CharlieStephens on 8-8-24 @ 6:05 PM

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