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Old 03-31-2003, 04:20 PM
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Red face trans speedo delema

Hellow fellow hot rod fans.I'm a proud owner of a 1966 Ford Musstang 289 with a 4 spped trans that has a problem with the speedo.When I bought the car the speedo worked but jumped form 0-120 while driving.So far I have removed the trans and changed the drive gear and matching driven gear with the same number theeth as the one I removed. Now the speedo only works in reverse stays on 0 when in forward speeds.I've tried two different other gear sets per advice from Mustangunlimeted to no advale.HELP PLEASE if you have ever run into this problem before.I enjoy reading the advice on the bulletin board every nite.

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Old 03-31-2003, 05:00 PM
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Have you changed the cable? And make sure the housing where the cable screw into is not striped out.
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Old 04-01-2003, 09:40 AM
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[quote]When I bought the car the speedo worked but jumped form 0-120 while driving.So far I have removed the trans and changed the drive gear and matching driven gear with the same number theeth as the one I removed. Now the speedo only works in reverse stays on 0 when in forward speeds.<hr></blockquote>

Usually, when a speedometer jumps in this manner, it is either a kink in the speedometer cable or a bad speedometer head. When you changed gears, did you put the right pitch gears back in? That would explain operation in reverse.

You can check for a kinked or binding (lack of lube) cable or bad head by disconnecting the cable housing from the head and operate the vehicle on jack stands to verify if the cable is turning or not. If it is without jumping or binding, it will be the speedometer head.
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Old 04-01-2003, 10:27 AM
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Another thing to check is to make sure that all of your conections are tight. When I bought my 57 back in 99 it would jump all over the place, when I took it to the speedo shop they told me it was lose and it has worked fine. They also made a Ratio change and corrected the speedo so that it worked perfectly.
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Old 04-01-2003, 11:13 AM
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After you have checked for kinks, proper routing and binding of the cable, disconnect the cable from the head, and pull the cable out of the housing with a pair of needle nose pliers. Grease the cable (wheel bearing grease)and reinstall the cable back in the housing. Thats the 1st step in diagnosing speedo issues and that generally takes care of 90% of those problems. With yours jumping from 0 to 120, that almost sounds like speedo head problem, but try this and what the other guys said.

and put that original drive gear back in.

Thats just my professional opinion
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