Trans fluid disappearing.

Discussion in 'The "Juice Box"' started by Bill Nuttle, May 27, 2018.

  1. Bill Nuttle

    Bill Nuttle Well-Known Member

    on my 65 Skylark with the ST300 trans twice now has started slipping. Both times I was down over 2 quarts. No obvious leaks. Front and rear seals are both dry. Doesn’t look like the cooler in the radiator is leaking either. Any guesses?
  2. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD" Staff Member

    The vacuum modulator diaphragm can have a pinhole leak and slowly pull ATF into the intake where it is burned in the cylinders. Remove the modulator and point the vacuum nipple down. If any ATF drips out, you've found the issue.
  3. Bill Nuttle

    Bill Nuttle Well-Known Member

    That's kinda what I'm thinking it is too. Already ordered up a new one ;)

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