Duramax Diesels Forum Truck of the Week
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Old 05-16-2018, 06:18 PM
Bigred22556 Bigred22556 is offline
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Default Weird allison issue

So I'm having an issue and it has happened with two transmissions now at random times my transmission will puke all its fluid out fill it back up and it will be fine no leaks for weeks then it dumps all the fluid again I'm at a loss as to what it'll be
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Old 05-16-2018, 07:54 PM
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Does temperature spike during this?
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Old 05-16-2018, 08:05 PM
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Quote:
Originally Posted by Bigred22556 View Post
So I'm having an issue and it has happened with two transmissions now at random times my transmission will puke all its fluid out fill it back up and it will be fine no leaks for weeks then it dumps all the fluid again I'm at a loss as to what it'll be
Have someone qualified check it. We have no idea without seeing the truck.
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Old 05-16-2018, 08:43 PM
Bigred22556 Bigred22556 is offline
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No temp spikes at all and that's the problem I'm a trans tech and it has me dumbfounded two transmissions same issue new Tcm same issue I'm lost
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Old 05-16-2018, 10:58 PM
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Same or new converter? What is the fluid level on the dip stick while warm prior to it puking?

Is the fluid clean and clear when it comes out or is it milky or strawberry shake colored?
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Old 05-17-2018, 06:27 AM
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Did you flush the cooler prior to installing the first transmission ?
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Old 05-17-2018, 09:28 AM
Bigred22556 Bigred22556 is offline
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The fluid is clean new converter on both transmissions and it is at proper levels for the temperature it doesn't matter if the trans is hot or cold when it pukes fluid it has done it cold at start up and hot on shut down and the cooler was flushed both times
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Old 05-17-2018, 09:58 AM
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Possible a front seal on the transfer case leaking into the trans. Check fluid in the TC.
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Old 05-17-2018, 04:07 PM
Bigred22556 Bigred22556 is offline
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I checked it and it's full I also built it when i replaced the transmission the first time
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Old 05-17-2018, 07:09 PM
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Checked the vent?
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Old 07-09-2018, 08:32 PM
Bigred22556 Bigred22556 is offline
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I figured it out the tcm was bad (go figure) it was calling randomly for extremely high line pressure higher than what the trans was designed for and it was popping the relief valve and blowing the fluid out of the vent and screwed the seals up in two brand new ati transmissions
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Old 07-10-2018, 06:36 AM
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Quote:
Originally Posted by Bigred22556 View Post
I figured it out the tcm was bad (go figure) it was calling randomly for extremely high line pressure higher than what the trans was designed for and it was popping the relief valve and blowing the fluid out of the vent and screwed the seals up in two brand new ati transmissions
TCM can not do that.
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