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Old 10-04-2003, 10:34 AM
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Transmission Vacum Line

The vacum line to my TH350 transmission on my 71' Chevy is very difficult to connect and keep connected to the fitting on the intake. The metal section just never seems to be bent the right direction and is a real pain. It has rubber vacum hose on each end and I am asking if I can just do away with the metal line and run rubber vacum hose the entire distance? Thanks in advance for your help.

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Old 10-04-2003, 10:51 AM
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Sure, won't hurt a thing. Just make sure its routed good so it won't get pinched or rubbed through by something.
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Old 10-04-2003, 07:55 PM
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whats the vaccum line for?? ive never seen them ran... just plugged off
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Old 10-04-2003, 08:21 PM
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It controls your shift modulator inside the transmission.
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Old 10-04-2003, 09:41 PM
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Well there's nothing that says that you have to run a metal line but I always do. They aren't all that hard to bend and they only have to be close since you have hose at both ends. That line is critical in making sure the trans sees the correct amount of vacuum to control shifts. Longer lengths of rubber vacuum hose tend to collapse when old, a metal line can not collapse. If you are having trouble with the line popping off you need to fix that problem and not jury rig it.


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Old 10-04-2003, 11:37 PM
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Cool

the problem with all rubber vacuum hose instead of a steel line is some times the rubber hose will collapse and not provide a good vacuum signal to the tranny.

I have seen some of the cheap vacuum hose on a long run it would split from the constant collapse and release when the engine was started & stopped
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Old 10-05-2003, 10:13 AM
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Another problem with a rubber line is the heat. The line will need to be supported the whole length to keep it from coming off. Usually that means up against the case of the trans. The hose will quickly dry out and crack, thus no vacuum to the trans. Stick with the metal line and re-form it if necessary. You can make it where the metal part does not go into that metal fitting, just have the rubber hose make that connection.
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Old 10-05-2003, 10:24 AM
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Rubber is cheaper than steel, if it would work thats what the manufacture would have put on it. It is for vacuum, and it will suck flat. HTH

Good Luck
Troy
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