Pushing Transmission Fluid through breather

Discussion in 'GT350 and S550 Technical Forum' started by xXANCHORMONXx, May 6, 2019.

  1. xXANCHORMONXx

    xXANCHORMONXx TMO Intermediate

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    Most of you may not know that on the driver side firewall there is a green cap with a hose attached to it. This is the transmission breather.

    Ever since I started running slicks I find transmission fluid coming through. I did bring it to the dealer and they swapped the entire breather assembly.

    However it did the same thing at Sonoma this past weekend.

    Has anyone else experienced this? I may make my own breather setup at this point.

    *Also transmission fluid is at the correct level and the temps are just perfect.*

    TIA
     
  2. TMSBOSS

    TMSBOSS TMO Addict

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    I had a similar issue when using a new brand of fluid. Some simply foam more than others. I switched back to redline and have had no issues since.
     
  3. 2012-Boss

    2012-Boss TMO Addict

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    I believe there are a couple of GT350 owners on the board who had to replace the transmission vent line with a larger overflow reservoir because of this issue. At least one of them had the modification done by a Ford Dealer at the direction of Ford Performance. Maybe one of them will chime in with a parts list and pictures.
     
  4. JeffV8

    JeffV8 TMO Race

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    My 19 PP does the same.
     
  5. VoodooStang

    VoodooStang TMO Intermediate

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    Transmission vent breather. Located to the left of the brake fluid reservoir

    5155BAEB-E494-4BEE-8770-AFF05C83C030.png 88BFF69D-5898-4510-81EB-B91227D0D09A.jpeg
     
  6. xXANCHORMONXx

    xXANCHORMONXx TMO Intermediate

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    Just wanted to follow up.

    I pulled off the green cap on the transmission breather, put a 3/8 hose with clamp into a catch can with a K&N breather filter.

    I haven’t checked to see if anything went in the can but at least I won’t have any fluid on the firewall. Just tested it this weekend at the track with no issues
     

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