The Dreaded Tranny Pan Leak

Transmission and Drivetrain Tech

  1. George Jets

    George Jets 1967 Dart 2 Door FABO Gold Member

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    Did you degrease all threaded bolt holes then coat them with Aviation Sealer. Then degrease all bolts and threads then coat them with aviation sealer.

    Then at pan assembly brush on more aviation sealer at the holes. Then install the bolts and evenly snug them down.

    _______________

    My friend's older RV with a 460/C6 automatic, the tranny pan was leaking badly. Enough to lose 2 quarts of fluid over time, making a mess of the floor where parked.

    Decreased the pan and gasket perimeter with brake parts cleaner, blow dry with compressed air. A few times.

    Mind you this is being done with the full load of trans fluid in the pan yet.

    Now took out one bolt at a time, degreased with brake parts fluid, mopped it all up with aviation sealer, and reinstall the bolt. Then on to the next bolt one at a time.

    All bolts back in and sealed, holes sealed, treads sealed. No more leaks what so ever.

    Had clean red fluid in it so it saved the mess of full pan removal, and the cost of new fluid.

    So as stated in the RV World, he is now a Happy Camper, no more leaks.

    He can now park it in his driveway without making a mess of it.

     
  2. CudaFactHackJob

    CudaFactHackJob FABO Gold Member FABO Gold Member

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    No shock there. You used a generic gasket. You sprayed some crapola onto it. You didn't hit the holes up away from the trans. I think I might remember a time or two that a filter kit or rebuild kit came with a Duraprene gasket. It used to bother me to throw away brand new pan gaskets, but they're worthless on a tin pan if they're not Duraprene. The gasket will be either black or reddish brown and will have the word "Duraprene" stamped on it. Just my humble opinion..
     
  3. 512Stroker

    512Stroker We are all here because we are not all there.

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    "Aviation sealer"
    Do you have a link to the stuff you use?
     
  4. George Jets

    George Jets 1967 Dart 2 Door FABO Gold Member

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    Available at most auto parts stores.

    Screenshot_20210413-124133_Chrome.jpg

    20210413_124419.jpg

    Just as important as the right sealer, is to get the sealing surfaces 100% oil free with fast drying Brake Parts Cleaner in the Red can.

    Screenshot_20210413-124744_Chrome.jpg

    Can clean up excess sealer off hands and tools with the brake parts cleaner on a wrag.
     
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    • CudaFactHackJob

      CudaFactHackJob FABO Gold Member FABO Gold Member

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    • Ron816

      Ron816 Well-Known Member

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      If a cork gasket isn't doing the trick, there has to be a problem with the mating surface's
       
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      • CudaFactHackJob

        CudaFactHackJob FABO Gold Member FABO Gold Member

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        That's what SHE said..
         
      • 512Stroker

        512Stroker We are all here because we are not all there.

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        See my new thread
        " I fixed the dreaded tranny pan leak"
         
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