4r100 leaking from vent - Ford Powerstroke Diesel Forum
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Old 03-15-2014, 01:59 PM
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4r100 leaking from vent

So all of a sudden it just starts leaking fluid in reverse, slowly got worse over a week and now when reverse it pours out. It leaks out from the vent or around the vent on the back. The hose is disconnected, don't know if the pressure caused it to pop off? When in park it is only a small stream but reverse really pours. Any ideas?
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Old 03-18-2014, 05:20 PM
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Old 03-18-2014, 06:15 PM
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Someone can probably tell me why I'm wrong for thinking this, but have you checked your trans cooler? If it's still original, it might be clogged. When I replaced mine there was all kinds of gunk in it. I have no idea if that would actually cause your problem, but it's a place to start.
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Old 03-18-2014, 06:16 PM
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I bet your transmission is cracked right there.
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Old 03-19-2014, 03:24 AM
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Quote:
Originally Posted by schlutzer View Post
I bet your transmission is cracked right there.
This is exactly what happened to me. I had a leak that was terrible in reverse, pulled the trans down to find I had cracks that the PO had tried to hide with some JB weld. The most frustrating part about mine is it drove fantastic, just would spew like hell in reverse.

Save your self some time, I know this sounds crazy, but if you aren't 100% sure it's coming from the vent pull the trans down and use some penetrant and developer to check for cracks. It's a lot of work to pull it down, but it's much more relieving to know for sure.

David
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Old 03-19-2014, 09:01 AM
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Yup I just sold my old auto to a guy that described his leak exactly the way the OP has sadly
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Old 04-28-2014, 11:46 AM
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So found the problem, as i thought cracked case geting it built by a local trans shop. Hope this is the last time!
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