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Old 01-29-2006, 03:05 AM
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C-4 Transmission. (1965 Mustang)

Does anyone have a good picture of how the hose connects to the vacuum modulator valve in the transmission? I think I might have it set up wrong, and that would affect alot.

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Old 01-29-2006, 10:26 AM
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Quote:
Originally Posted by 65Stanger
Does anyone have a good picture of how the hose connects to the vacuum modulator valve in the transmission? I think I might have it set up wrong, and that would affect alot.
the factory used a steel line with rubber hose at each end. A full length of rubber hose can collapse from the vacuum causing problem shifts

you need full manifold vacuum to the modulator. Check the line for good flow , no carbon build up or oil the line.

pull the hose off the modulator on the tranny... does oil come out the hose nipple?? If oil comes out , the modulator is bad.
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Old 01-30-2006, 02:30 AM
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Where would the oil be coming out of? I don't think there's any oil coming out. And should the car be running?
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Old 01-30-2006, 06:59 PM
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It's just a vacuum line that runs from the nipple on the back of the modulator to any open port on the intake manifold. I have used all rubber line with no problems, but the steel line is the best way to go. Note that there is a pin inside the modulator that (if you don't know about it) often falls out if the modulator is removed. I'd make sure it's still there if you have removed yours. You can also get adjustable modulators (if yours isn't) that will let you slightly adjust the shift points and firmness.
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Old 01-30-2006, 07:04 PM
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The oil would come out of the 'nipple' the vacuum line attaches to if it were bad.
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Old 01-30-2006, 07:32 PM
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Ah okay cool. It was really dirty and I cleaned it out and I figured that might help, but to no avail. I'm going to replace it tomorrow and everything should be all good after that. yeah mine was adjustable and the new one that I get will be too. There was a ton of oil around the nipple, and yeah I have a steel line going to it, with about 5 inches of rubber hose at the end of the steel line that's right next to the modulator valve, so it should have good vacuum. I'm going to test to make sure that air goes all the way through w/ an air compressor.
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