Transmission cooling lines

Discussion in 'Engine & Drivetrain' started by Ronzxcvb, Sep 19, 2019.

  1. Ronzxcvb

    Ronzxcvb Member

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    One of my transmission cooling lines has a leak
    Can I cut out the bad section and replace with a piece of fuel line?
     
  2. Big Mama

    Big Mama Full Access Member

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    I think most lines carry lower psi but how to seal up the patch? They’re not overly expensive to replace with new. What year model and engine?
     
    Last edited: Sep 20, 2019
  3. SnowDrifter

    SnowDrifter Full Access Member

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    The trans cooler is fairly low pressure. Under 40psi iirc.

    That being said just replacing the lines isn't hard and that would be my suggested route
     
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  4. Fless

    Fless Supporting Member

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    Not fuel line, the tranny fluid will eat right through that in a matter of weeks. I don't think that's a high pressure line, IIRC.

    Mine have been replaced since the steering rubbed a hole through one, but now that one's lashed up out of the way.
     
  5. NoReverseYukon

    NoReverseYukon Member

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    I bought new hard lines when I rebuilt my tranny. Getting those to go where they're supposed to was such a PITA that I used braided line instead. Not to mention those F-ing C-clips to secure them.
     
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  6. Ronzxcvb

    Ronzxcvb Member

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    Thanks for the help
    I ordered some from Auto Zone they said would be in today. But when I went into town to pick them up now they wont be in until Tuesday and I need the truck on Saturday.
    I put on a add on cooler years back that used rubber lines so thought I could just patch it up with some fuel line I have.

    I'm glad I asked first.
    kid found some about 40 min away so going to pick them up tomorrow.
     
  7. TheAutumnWind

    TheAutumnWind Full Access Member

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    I bypassed the radiator on my trans cooler lines since ive added a larger trans cooler. Just cut out a section flared the ends and ran rubber hose.
     
  8. Rocket Man

    Rocket Man Build It Better

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    Fuel line is fine. It’s whats included in most aftermarket trans cooler kits including Tru-Cool. And it’s a low pressure system. Best to only use it temporarily though unless you add flares to the hard lines so the clamps work better.
     
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  9. Fless

    Fless Supporting Member

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    Fuel line won't last when used as a tranny fluid line; it gets soft and deteriorates relatively quickly. Short term, it's probably fine, but for a lasting fix, no. Think @Tonyrodz may have experienced it, and I have.
     
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  10. Rocket Man

    Rocket Man Build It Better

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    Now that I think about it, trans line is heavier than fuel line. And probably made from different stuff. I was wrong about Tru Cool, they use trans line.
     
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