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Old 05-08-2011, 14:33   #1 (permalink)
Shaun Elsbury
 
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67 mustang speedometer not working right

I have a 67 mustang with a 390 and a RUG 4 speed toploader. It isn't the original engine or transmission for the car. It originally had the inline 6 and an automatic. It has a different 8 inch rear end also. What i'm curious about is if any of you know what gear i need for the transmission so that my speedometer will be accurate. Currently when i am traveling about 60 on the road the speedometer reads about 10 mph.
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Old 05-08-2011, 17:40   #2 (permalink)
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Re: 67 mustang speedometer not working right

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Originally Posted by Jager62 View Post
I have a 67 mustang with a 390 and a RUG 4 speed toploader. It isn't the original engine or transmission for the car. It originally had the inline 6 and an automatic. It has a different 8 inch rear end also. What i'm curious about is if any of you know what gear i need for the transmission so that my speedometer will be accurate. Currently when i am traveling about 60 on the road the speedometer reads about 10 mph.
Hello and good day:

I have a 67 289cc 3 spd that i am, and have been restoring for the last 2 years.

It sounds like a broken or frade cable to the gearing in the Tranny.

Here are a few links I found:

1966 Mustang speedometer problem - Ford Mustang Forums

1967 1968 FORD MUSTANG SPEEDOMETER CABLE WITH 4 SPEED | eBay





Tachometer Repair Restoration for Ford Classic Cars

1968 Ford Mustang
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Old 05-08-2011, 23:12   #3 (permalink)
Shaun Elsbury
 
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Re: 67 mustang speedometer not working right

Well, I was told the wire was fine. My friend told me because the speedo wasn't designed for this tranny or rear end, that the gear in the tranny might be turning a different speed than what is required to turn it accurately. Does this seem to hold any truth?
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Old 05-09-2011, 04:34   #4 (permalink)
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Re: 67 mustang speedometer not working right

Agree with your friend , with all the changes and mods the speedo drive ratio / gearing will be miles out of sync with head.
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Old 05-09-2011, 08:03   #5 (permalink)
Shaun Elsbury
 
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Re: 67 mustang speedometer not working right

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Originally Posted by R.S.LOGAN View Post
Agree with your friend , with all the changes and mods the speedo drive ratio / gearing will be miles out of sync with head.
Okay. The gears themselves I hear aren't so bad to get, but it's just determining what gearing I need that is difficult. Perhaps there is someone out there with a 390 and a 4 speed toploader and an 8 inch ear end that knows what gear they have? How many teeth on that speedo gear?
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