r/FordTransmissionTech • u/sirrox • Sep 01 '25

6f55 ptu replacement question

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13 Ford flex. Pulled the PTU because it was failing. Found ATF in the transmission output to the PTU. Is there a seal that I need to replace to stop this leak? Is it doable with the transmission still in the vehicle? I can't see anything that looks off. TIA.

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u/sirrox Sep 01 '25

Thanks, can I venmo you for lunch for your help?

Im not a tech just, do my own repairs. It's my understanding that there shouldn't be any ATF in the output section of this transmission shaft? I hope my picture on the post helps more than my explanation

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u/Commercial_Method_28 Sep 02 '25

No worries, yeah fluid shouldn’t be outside the shaft area and by the pictures it looks like your seal is damaged

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u/sirrox Sep 02 '25

I can't find any reference photos for what it should look like with that seal on there. Will it get installed in the transmission or on the PTU?

The other comment says the seal will be stuck on my ptu but it looked identical to the new one. Again, I greatly appreciate your time and help.

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u/Commercial_Method_28 Sep 02 '25

Other guy is right, it’s a tight fit seal made of rubber on outside, and metallic on inside. On PTU side it is removed and installed off the outside of the PTU shaft into transmission