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4L80e Vacuum Line

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Old 12-02-2009, 05:55 PM
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Default 4L80e Vacuum Line
What's the vacuum line at the top (right behind the bell housing) of the 4L80e for? Should I block it off, or does it need vacuum?

You can see it in this pic on the top right of the trans at the back of the bell housing.
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Old 12-02-2009, 06:37 PM
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Looks like the overflow to me.
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Old 12-02-2009, 06:57 PM
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Its a vent.
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Old 12-02-2009, 08:14 PM
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Its and overflow /vent do not block it or hook vaccume to it. Though for safty reasons some do like to run a hose down below pan lever or to a catch can incase it did ever vent trans fluid
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Old 12-03-2009, 09:07 AM
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awesome. thanks for the info. i remember there was a hose on it when i got the trans, but it was a year ago so i wasn't sure.
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Old 12-04-2009, 11:50 AM
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I ran a tube from that to the back-bottom of the trans. In case it does vent out some fluid then it won't dirty up my trans .
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Old 12-06-2009, 08:54 AM
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Originally Posted by MadIceV8
I ran a tube from that to the back-bottom of the trans. In case it does vent out some fluid then it won't dirty up my trans .
Nice to hear your keeping my baby clean!
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Old 12-06-2009, 01:59 PM
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Originally Posted by MadIceV8
I ran a tube from that to the back-bottom of the trans. In case it does vent out some fluid then it won't dirty up my trans .
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anyone ever used or heard of this converter




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