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  •  » FYI Ford, Classic Mustang Tech Discussion
  •  » Rear Axle Vent Breather Hose

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    5/20/2021 5:33 AM  #1

    Toploader
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    Registered: 4/15/2013
    Posts: 1,640

    Rear Axle Vent Breather Hose

    While the car was in getting the rear springs reset, we discovered that the breather vent hose off the rear axle vent is missing.
    Does anyone know where this connects to, or how long the hose should be or what size the hose is?
    I need to get another hose and fix this.

    1964-1/2 D Code Coupe - 289 V8, 4 Speed Toploader, 3.00 ratio rear, Autolite 4100 Carb, 15" tires, Pertronix ignition
     

    5/20/2021 6:26 AM  #2

    josh-kebob
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    From: Madison, AL
    Registered: 4/06/2013
    Posts: 2,902

    Re: Rear Axle Vent Breather Hose

    The rubber hose extends from the axle housing up to a hole in the frame rail.

     

    5/20/2021 7:00 AM  #3

    John Ha
    I FYI 24-7

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    From: Mitchell, SD
    Registered: 4/02/2013
    Posts: 932

    Re: Rear Axle Vent Breather Hose

    The hose needs to be long enough to allow the rear suspension full travel without breaking, coming loose or getting damaged by something.  When I did mine I installed the hose with the rear axle unsupported (hanging by the springs and shocks) and made sure that the hose was not on the exhaust or getting tangled in the brake line when the suspension was compressed or at normal ride height.
     

    Founding Member of the Perpetually Bewildered Society
     

    5/20/2021 1:20 PM  #4

    TKOPerformance
    Hyper FYIFORD ADDICT

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    From: Newark, DE
    Registered: 12/15/2014
    Posts: 7,499

    Re: Rear Axle Vent Breather Hose

    Size wise it should be 3/8" I believe.  There should be a one way valve on the end that allows pressure to escape the axle, but won't allow water to enter.  Not really an issue unless you are going to be fording streams though. 

     

    5/20/2021 2:07 PM  #5

    Toploader
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    Re: Rear Axle Vent Breather Hose

    Do the parts suppliers sell the hose at the correct length and size? I will probably copy it and make one.
    I'm still at a loss on what happened with mine and why it's not there. Hopefully no junk got in there...

    1964-1/2 D Code Coupe - 289 V8, 4 Speed Toploader, 3.00 ratio rear, Autolite 4100 Carb, 15" tires, Pertronix ignition
       •Thread Starter
     

    5/20/2021 2:35 PM  #6

    TKOPerformance
    Hyper FYIFORD ADDICT

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    From: Newark, DE
    Registered: 12/15/2014
    Posts: 7,499

    Re: Rear Axle Vent Breather Hose

    The factory hose is unreinforced rubber that degrades over times and typically just cracks and falls off.  Its not at all uncommon.  You can replace it with fuel line or other rubber hose, but its hard to find 3/8" rubber line that isn't fuel line in my experience.  No reason not to use fuel line.  I'm sure the OEMs just go cheap to save $0.005/car.  And no, there isn't an extra zero in there. 

     

     

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