Tremec TKO breather leaking

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My TKO tremec was leaking generous amounts of oil out of the breather at the top front of the trans case.
I removed the small cap from the breather and then connected a 2 foot long hose to the stub on the case. I looped the hose up and around a bracket on the firewall, similar to venting the rear housing. A 30 mile test run shows no leaking at all.
Crimped cap on breather can be pried off, and contains a spring and plastic disc to cover breather hole.
Now I have to power wash bottom of car to remove trans oil and dirt.

[timsullivan]

You might want to check the fluid level to as I suspect the trans is overfilled.

[G-Pete]

Some oils also foam up -

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Trans fluid level has been checked multiple times. Even left about a half inch low to see if that made a difference. It did not. I have only used the GM synchromesh (recommended fluid) so I don't believe that was a problem. I have logged several hundred miles of various driving with no leaking from the installed tube on the breather. Similar to breather on 9" rear housing.

[ray humbel]

What oil are you using? Tremec told me to use GM Synchromesh Tranmission Fluid Took 2 2/3 Quarts