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Vacuum shift module hose

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Old Feb 24, 2024 | 10:45 AM
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Vacuum shift module hose

Got an 87 f150 300 straight 6 and i dont know where the Vacuum shift module hose leads to under the hood, could anyone help me out here
 
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Old Feb 24, 2024 | 11:37 AM
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Vacuum shift module?
 
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Old Feb 24, 2024 | 11:52 AM
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Originally Posted by My4Fordtrucks
Vacuum shift module?
yes it comes off of the transmission, and apparently there is a vacuum hose that comes off it and goes to the intake but i dont know what hose from the intake it connects to


 
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Old Feb 24, 2024 | 12:32 PM
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I’d have to check when I get home. I believe it connects directly to the vacuum “tree” on the intake manifold.

Shift modulator
 
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Old Feb 24, 2024 | 01:11 PM
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Originally Posted by My4Fordtrucks
I’d have to check when I get home. I believe it connects directly to the vacuum “tree” on the intake manifold.

Shift modulator
Yep. Right to the tree. Make sure to keep it clear of hot stuff.
 
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Old Feb 24, 2024 | 02:51 PM
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Vacuum modulator is the part you are talking about
 
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Old Feb 24, 2024 | 07:12 PM
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Originally Posted by R&RFord
Yep. Right to the tree. Make sure to keep it clear of hot stuff.
thank you thank you, that helped with my shifting a lot better lmao
 
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Old Feb 25, 2024 | 05:09 AM
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By chance if you have to replace it
They make those modulators with different colored stripes depending on your altitude
If you have ever seen one blow blue smoke going down the road (a leaking modulator diaphragm), it looks like a mosquito abatement truck
 
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Old Feb 25, 2024 | 09:23 AM
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Originally Posted by manicmechanic007
By chance if you have to replace it
They make those modulators with different colored stripes depending on your altitude
If you have ever seen one blow blue smoke going down the road (a leaking modulator diaphragm), it looks like a mosquito abatement truck
And it will quickly lead to either transmission failure or hydrolocking your engine with transmission fluid (lol)
My 1977 buick electra has a bad modulator and last I moved it i barely could crank it over, it was essentially siphoning ATF to the intake and it sat long enough ATF managed to pool on the intake through the threads of the bolts of the intake
 
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