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Classic Mustangs Tech Forum

Technical discussions specific to 1964-1967, 1968-1970, and 1971-1973 Classic Mustang. Discuss all tech related to in-line six cylinder and V8 powered Vintage Mustangs here.

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Unread 05-31-2012   #1 (permalink)
66Sprint200 is offline MACH I Member

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Default 1966 Mustang vacuum line

Hey guys, can somebody post a picture and a diagram of how the transmission vacuum line gets routed, especially at the intake manifold? I just received a new one from CJ Pony Parts, part # MUM1004. But no matter what way I try I cannot determine how it's supposed to be routed. I can't go off the original because that is 3 6" bits of metal all connected by hoses. Thanks guys, Michael.
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2005 Mustang 4.0 litre... Airaid CAI, Honeycomb taillamp panel, more mods to follow.
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Unread 06-01-2012   #2 (permalink)
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Why don't you drop in a V8?

Seriously, I can't seem to locate a diagram at this moment, but the vacuum source must be from the intake manifold or in other words, so that there is vacuum going to the transmission's modulator valve at all times. This includes when the throttle is closed and the engine is at idle.

You don't want the "Timed or Ported" source like the vacuum source that some people connect to their distributor vacuum advance canister. This source provides no vacuum when the throttle is closed or when the engine is at idle.
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Unread 06-01-2012   #3 (permalink)
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I know that. My transmission has been connected to the intake manifold. It's just I wanted the proper line, not some hacked together cheap garbage, that looked and functioned badly. The problem is, from what I can find. There is supposed to be a junction or 90* fitting screwed into the intake manifold with an opening pointing towards the front of the car for transmission vacuum line. I can't find a fitting to save my life.
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Unread 06-01-2012   #4 (permalink)
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here's how it looks in my '66 sprint. the trans vac line is blue.
not sure if this is correct, but it's how it looked when i got it

1966 Mustang vacuum line-vac-line-2.jpg1966 Mustang vacuum line-vac-line-3.jpg1966 Mustang vacuum line-vac-line.jpg
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Unread 06-01-2012   #5 (permalink)
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That looks like the fitting I need. The problem is finding one. I think the male end (screws into intake manifold) is 1/4 NPT, and the female (the opening the vacuum line screws into) is 3/8 NPT.
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2005 Mustang 4.0 litre... Airaid CAI, Honeycomb taillamp panel, more mods to follow.
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Unread 06-01-2012   #6 (permalink)
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If you're not concerned about originality, you can probably find what you need at Home Depot.
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Unread 06-03-2012   #7 (permalink)
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My 66 has a hard line that runs from the intake down to the trans. it has a short piece of hose to connect to the modulator. The line comes straight out of the intake and then turns to the rear. I'll PM you and give my e-mail addy so I can send a few pics of the routing.
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Unread 06-03-2012   #8 (permalink)
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I've got the new line. It's like va176jb's. I just need to find a 90* fitting that I can point towards the front of the car. I don't know what style the original line was (I know there were 2 or 3). Like I said, the one on my car is just random bits of old rubber hose and kinked metal tubing stuck together (sometimes I hate the previous owner).
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2005 Mustang 4.0 litre... Airaid CAI, Honeycomb taillamp panel, more mods to follow.
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Unread 06-05-2012   #9 (permalink)
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Well, I got an original fitting right off a 1966 Mustang's 200ci six. So once the car has cooled down I'll finish installing the new line.
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2005 Mustang 4.0 litre... Airaid CAI, Honeycomb taillamp panel, more mods to follow.
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