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Old 05-15-2003, 04:38 AM
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Post Vacuum Line?

I can't seem to find a vacuum line leading from my manifold to my tranny. I have a tri-power setup and the only things I have coming off the manifold is the heater hose and the PCV line...

How essential is having a vacuum line to the tranny, what type of impact does it have on how the tranny shifts. I took her out for a 1/2 mile spin for the first time and didn't feel like she even made it into second... could this be the cause?

Thx
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Old 05-15-2003, 04:41 AM
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What kind of trany.
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Old 05-15-2003, 05:46 AM
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sorry... c4.

Like I said, didn't seem like she shifted.
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Old 05-15-2003, 06:17 AM
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C4 has to have vacumn to shift out.
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Old 05-15-2003, 06:24 AM
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That explains it and makes me feel a sigh of relief. Where does the line run to on the tranny, is there a stanard line or should I just get some hose? Can it go to the same vacuum line that the PCV is on?
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Old 05-15-2003, 07:17 AM
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The tranny has a vacumn modulater, there should be a slip on fitting for a rubber hose. The other end should come from the intake direct vacumn. Normally this is a steel line with short rubber at each end
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Old 05-15-2003, 07:47 AM
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a steel line? That would mean that there should be a specific "steel line setup" for each type of manifold out there.

Like I said, the PCV is coming off the back of the manifold, can the PCV and tranny share the same manifold opening? Is there enough "suction" there is what I'm asking.
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Old 05-15-2003, 08:33 AM
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the steel line is mostly just to prevent vacuum collapse since it is such a long run usually. It's easy to bend up and use.

not to mention usualy quite close to exuast.

You have the pcv going into the manifold? Don't you have a fitting on the carb for it?

anyways, no, it's fine for the 2 to share.
[ May 15, 2003: Message edited by: ummduh ]

[ May 15, 2003: Message edited by: ummduh ]</p>
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Old 05-15-2003, 09:17 AM
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no... won't go to the carb. Tri-power setup and the linkage won't allow that unless I did it to all 3 carbs.

Can get this line at any automotive shop?
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Old 05-15-2003, 09:42 AM
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You can use hard brake line and get a barbed fitting for each end.
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Old 05-15-2003, 09:53 AM
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where does the line connect to the tranny... specofically, where on the tranny? Front passenger side?
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Old 05-15-2003, 10:36 AM
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yea just use a length of brake/fuel line and cut it to length. You can run it in a flarer a bit to make a flare, or just don't cut it, leave the fittings on, and you have pre-made flares to hole the rubber line on. Kinda ghetto, but works.

yes, the modulator should be in the front passenger side of the trans.. it's a fairly large canister, really hard to miss!

sorry, didn't notice the tri-power.. your forgiven for not running it to the carbs

[ May 15, 2003: Message edited by: ummduh ]</p>
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Old 05-15-2003, 11:35 AM
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any idea what size hose is needed?
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Old 05-15-2003, 03:14 PM
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WHat kind of C-4 trans is it? The only ones I have seen have had the modulator in the rear on the right(passenger) corner. The modulator is only about 1 1/2" in diameter and about 2" long. It is right in front of the mount and takes a hose with a 90 Deg bend in it. That is of course if it is a Ford C-4, like they used from mid 60's until the 80's that I know of.
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Old 05-15-2003, 04:31 PM
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The best way to tell the size, is look at it.
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