Th-350 leaking out of the speedometer gear housing

Discussion in 'Transmission & Driveline Topics' started by TDPalmer, Mar 26, 2017.

  1. TDPalmer

    TDPalmer Veteran Member Lifetime Gold Member

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    I've been having this issue where I'm having transmission fluid leak out of my speedometer housing, it seems to leak worse right after I get done driving it. It will leak maybe a pint out over a couple of weeks and leave a huge puddle underneath it. I have replaced the seals once with the Classic Transmission Solution Stop Leak Kit, and a new speedometer gear. After I emailed them saying it didn't work the first time they sent me another kit free to put in it plus another a free gear. I installed them this weekend and I will keep looking to see if that fixes my problem.

    When I take the cable off the housing no fluid comes out of the cable or it's sleeve and it doesn't come running out of the housing hole when I take the housing out.

    Is there anything else to look at to stop the leak? I am pretty confident the transmission is not leaking from anywhere else I have crawled all over it looking for another leak, the pan seal is dry, and the rear housing is dry.

    [​IMG]
     
  2. COPO

    COPO Veteran Member Lifetime Gold Member

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    GM still sells the bullit or you can just buy the O ring.
    In my case, I just bought a new O ring and used Permatex 2
    just on the outside area of the O ring to seal any possible leaks from the case.
    I have no leaks.
     
  3. 496z28

    496z28 Veteran Member Lifetime Gold Member

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    I second putting permatex on it. 515 is some amazing stuff. Lol
     
  4. brooksman9

    brooksman9 Veteran Member

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    The Right Stuff is good too.
     
  5. TDPalmer

    TDPalmer Veteran Member Lifetime Gold Member

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    Thanks for all the reply guys. I put permatex on it today after it started leaking from the new seals. If this don't work I'm gonna buy a new bullet with the seals already installed and go from there.
     
  6. Coadster32

    Coadster32 Veteran Member Lifetime Gold Member

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    You're on the right track. Mine was the small O-ring. My housing had permatex on the outside by the bullet. No leaks.
     
  7. COPO

    COPO Veteran Member Lifetime Gold Member

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    I don't see how the bullet would wear. Maybe the O ring is not the correct one and has slop.
     

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