Question about 1966 Ford Mustang

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Where does the vacuum line go on an automatic transmission in a 67 mustang

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You should have a thing that looks like a fuel filter close to the rear of the trans. called a transmission modulator, should look like this. . where does the vacuum line go on an automatic - transmission_vacuum_modulator.jpg

Posted on Feb 07, 2010

  • John Fourteen Six Feb 07, 2010

    It did not come thru the firts time sorry.

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Line goes to manifold vacuum which goes to vacumm module on transmission most are on rear of transmission

Posted on Feb 07, 2010

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What transmission does your trailblazer have ? automatic or manual ? If automatic 4L60E , it has no vacuum hose's ,unless you or someone else modified it . E in 4L60E stands for electronic . Back in the day there were vacuum hose's going to the automatic trans 1 to the vacuum modulator valve .

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Did you hook up the vacuum modulator on the transmission to the correct vacuum port on that Mustang engine?

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I swapped the original 6 cylinder out of 1960 comet for a 1965 mustang 6 cylinder now the trans is not shifting did i miss something


Well you could have missed the vacuum line that goes to the modulator on the transmission. It has to get unrestricted manifold vacuum. Also, the throttle valve linkage from the carb to the transmission may be off or just missing a return spring. Give a good look around and I'm sure toy'ii find one of the two.

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My 66 mustang automatic doesnt seem to shift right, can only go about 30 and the rpm is around 5000 but it wont shift


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I don't think it's in your linkage. It sounds like you may have a cracked or disconnected vacuum line leading to your vacuum modulator. Or you may have a fauly modulator. Check for leaks first...At the back of the motor on the passenger side there should be a small (in diameter) vacuum line comming from the carburetor to a metal line leading down and back toward the rear of the car. Then at the back of the trans there should be a small vacuum line leading toward the front of the car to a small metal line. If one or both of those vac lines are loose os broken thats most likley your problem. If not it's more likley the modulator.

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What does it mean that my 66 pony has a green dot trany?


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So your C4 tranny is the green dot which is an UPGRADED option. A better tranny better gears and stronger parts and what not, there was also the white dot tranny that was the cheaper or less performance transmission. As far as i understand the white dot was available for better fuel consumption HAHAHA which no one really cared about in 66 anyways.

In '65/'66 it was something like this:
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I put tranny it mustang. Acted like it was never there.


maybe you got a bad transmission??? did you check all the vacuums and lines and fluid level?

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