Author Topic: Speedo Cables / Drives  (Read 250 times)

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Offline Geoff Rose

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Speedo Cables / Drives
« on: May 14, 2019, 02:57:45 PM »
Hello fellow mustangers.
I hv a 67 RHD coup. My speedo reads faster than I am going.
I think when it was converted to RHD an Australian Ford speedo cable was used because I don't think the LHD speedo cable would reach across from the LHS of the transmission to the RHD instrument cluster.
Does anyone know if the gear at the end of the cable for Australian Fords and Mustangs is the same gearing?
I am trying to work out if it is an incorrect drive gear on the cable or the actual speedo.

Thanks   

Offline birdman

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Re: Speedo Cables / Drives
« Reply #1 on: May 14, 2019, 03:21:52 PM »
Hello fellow mustangers.
I hv a 67 RHD coup. My speedo reads faster than I am going.
I think when it was converted to RHD an Australian Ford speedo cable was used because I don't think the LHD speedo cable would reach across from the LHS of the transmission to the RHD instrument cluster.
Does anyone know if the gear at the end of the cable for Australian Fords and Mustangs is the same gearing?
I am trying to work out if it is an incorrect drive gear on the cable or the actual speedo.

Thanks

Colour of speedo gear (number of teeth) should correspond with your diff ratio.

Offline mcarnage59

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Re: Speedo Cables / Drives
« Reply #2 on: May 14, 2019, 04:20:39 PM »
Hello fellow mustangers.
I hv a 67 RHD coup. My speedo reads faster than I am going.
I think when it was converted to RHD an Australian Ford speedo cable was used because I don't think the LHD speedo cable would reach across from the LHS of the transmission to the RHD instrument cluster.
Does anyone know if the gear at the end of the cable for Australian Fords and Mustangs is the same gearing?
I am trying to work out if it is an incorrect drive gear on the cable or the actual speedo.

Thanks

Wheel and tyre combo exactly the same as original?
Always dreamed I'd have one!

Offline Clubman7

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Re: Speedo Cables / Drives
« Reply #3 on: May 14, 2019, 05:01:10 PM »
My 66 coupe is  rhd and I replaced the speedo cable recently with an off the shelf standard part.
Suppose it depends where the hole to enter the cabin is.

Offline Geoff Rose

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Re: Speedo Cables / Drives
« Reply #4 on: May 14, 2019, 05:05:48 PM »
Wheel and tyre combo exactly the same as original?
Rim size is same but tyres bigger height wise, they are a bit balloon.
Speedo diff ranges from 10 - 15 MPH.
Never thought of that will check.
Thanks

Offline Geoff Rose

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Re: Speedo Cables / Drives
« Reply #5 on: May 14, 2019, 05:06:55 PM »
My 66 coupe is  rhd and I replaced the speedo cable recently with an off the shelf standard part.
Suppose it depends where the hole to enter the cabin is.
I might get a new one and try.

Thanks reply.

Offline Geoff Rose

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Re: Speedo Cables / Drives
« Reply #6 on: May 14, 2019, 05:07:54 PM »
Colour of speedo gear (number of teeth) should correspond with your diff ratio.
OK thanks will look into it.
TA

Offline BAC

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Re: Speedo Cables / Drives
« Reply #7 on: May 14, 2019, 10:56:14 PM »
As birdman and mcarnage59 have said, the only things that will affect your indicated speed vs actual (provided you haven't changed the diff ratio) are the diameter of your wheels/tyres and the drive gear on the transmission end of the speedo cable.

Once we know the diff ratio, wheel/tyre size and what kind of transmission you have we can calculate the number of teeth you should have on the end of your speedo cable. It's then a simple job to yank this out and check against what you have now.
Cheers,
Brian

Offline Geoff Rose

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Re: Speedo Cables / Drives
« Reply #8 on: May 15, 2019, 10:00:02 AM »
As birdman and mcarnage59 have said, the only things that will affect your indicated speed vs actual (provided you haven't changed the diff ratio) are the diameter of your wheels/tyres and the drive gear on the transmission end of the speedo cable.

Once we know the diff ratio, wheel/tyre size and what kind of transmission you have we can calculate the number of teeth you should have on the end of your speedo cable. It's then a simple job to yank this out and check against what you have now.
Thanks Brian, Will check it all out.


 

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