Duramax Diesels Forum Truck of the Week
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Old 02-23-2008, 07:54 PM
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Default Transmission cooler line questions

My cooler lines have been leaking for almost 20k miles. I'm really wanting to do something about it besides replacing them with stock replacements. I found some cool AN fittings that can be clamped onto a straight tube. I was thinking about doing this and replacing the rubber on the stock lines with braided stainless hose and AN fittings. The only problem is the fittings I'm looking at are only good up to 50 psi, and I'm not sure how much pressure runs through there. Anyone know?

What about the fittings that go into the cooler, anyone know what they are?

If that doesn't work I may end up taking them to a hydraulic shop and having them make me something.

Anyone have any cooler lines for an 06 or 07 classic laying around they want to get rid of?
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Old 02-23-2008, 08:27 PM
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Same problem here. I have been looking into it for awhile too. I believe there is more than 50psi running in those lines, not sure how much. Please let me know what you figure out.
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Old 02-23-2008, 08:29 PM
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I think it's more like 200psi...
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Old 02-23-2008, 08:33 PM
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Quote:
Originally Posted by The Neens View Post
I think it's more like 200psi...
I'm afraid you're right. I kind of figured it's higher than 50.
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Old 02-24-2008, 03:52 PM
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This summer I plan on getting some hydraulic lines made up. I'm on my 3rd set of factory lines.
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Old 02-25-2008, 11:20 AM
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I looked into this and talked with Mike about it. IIRC he thought the lines saw 70-80 PSI, trans temps could be assumed at 275 MAX.

Earls has lines that fit this spec.

The tolerances between the lines and the block/starter/frame are tight down there. I would "sleeve" a braided line if you choose that mat'l. Braid is cool, but it chews through anyhting it contacts.

The hydraulic shop will have a SUPER TOUGH mat'l/sleeve you can wrap the braided line in, I can't memmer the name of it. It's black and they use it to cover the large hydraulic bucket lines at the mast, these rub the mast while in operation all day long. I use a stainless wire and wrap the cover to the line, versus zip ties. The zip ties will get brittle after a few months and break.

Good luck Dude.
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Old 02-25-2008, 11:50 AM
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I used one of the tube nut style connections that you are refering to when I assembled my lift pump/filter set up. It doesn't seem to seal all that well. It doesn't drip, but just has some build up crap. Doesn't work all that well at lift pump pressure, doubt it will at trans line pressure either.
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Old 03-05-2008, 04:08 PM
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Ordered my 4th set of trans lines under warranty today. Should be on the truck in 2 weeks.
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Old 03-05-2008, 05:04 PM
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Your hard on equipment Dan!!
They just replaced mine under warranty-the first set-25000km.
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Old 03-05-2008, 05:11 PM
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Cooler lines normaly see 83 psi in the Alli and with pump upgrades even more. I would not take out the flex part of the line as it is there to absorb vibration and avoid rubbing against metal.
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Old 03-20-2008, 01:44 PM
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Just got my 4th set of lines put in along with the TCM recalibration at 35 200 km. The whole ordeal took over 4 hours. It seems like the trans is relearning again, probably just because of the reflash.
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Old 03-30-2008, 11:34 PM
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Quote:
Originally Posted by MAXLLY View Post
I looked into this and talked with Mike about it. IIRC he thought the lines saw 70-80 PSI, trans temps could be assumed at 275 MAX.

Earls has lines that fit this spec.

The tolerances between the lines and the block/starter/frame are tight down there. I would "sleeve" a braided line if you choose that mat'l. Braid is cool, but it chews through anyhting it contacts.
If you did decide on hyd lines you wouldnt neccesarly have to go there
you could rought the lines in a different way....Just a thought
The hydraulic shop will have a SUPER TOUGH mat'l/sleeve you can wrap the braided line in, I can't memmer the name of it. It's black and they use it to cover the large hydraulic bucket lines at the mast, these rub the mast while in operation all day long. I use a stainless wire and wrap the cover to the line, versus zip ties. The zip ties will get brittle after a few months and break.
Agree with that
Good luck Dude.
zip ties in Canadas winter last about a day I would almost consider if i had the room cutting a larger hose to go over top of the hyd hose to protect it.....if you had the room to do so?
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Old 01-04-2009, 10:19 PM
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Bump:
My 4th set of trans lines are leaking again. So what size, thread, etc are the fittings on these lines? In the Summit catalog I found Aeroquip AQP racing hose. It's good for 1000 psi, and temps from -55F to +300F. It was -44F at my place on Saturday, so I need hose rated for cold temps. Anyone else been thinking about this?
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Old 01-05-2009, 12:12 AM
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Quote:
Originally Posted by coldLBZ View Post
Bump:
My 4th set of trans lines are leaking again. So what size, thread, etc are the fittings on these lines? In the Summit catalog I found Aeroquip AQP racing hose. It's good for 1000 psi, and temps from -55F to +300F. It was -44F at my place on Saturday, so I need hose rated for cold temps. Anyone else been thinking about this?
Let me know what you are looking for. I can most likely get it cheaper then you can get it through Summit. I work at Aeroquip, which is now a division of Eaton.
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Old 01-05-2009, 12:12 AM
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Your hard on tranny lines Dan. No problems with mine at all
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