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  #1  
Old 03-24-2014, 11:07 PM
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LRS360 LRS360 is offline
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Default Trans Cooler Line Issues

I just got the rebuilt transmission installed in my truck and have put 60 miles on it. I replaced the trans cooler line that contains the check ball with a straight piece. Unfortunately it's leaking at the OEM cooler. The top fitting is also leaking. I didn't install the top fitting; the previous owner did when they replaced the radiator.

Here is how I replaced the check ball line:

Fittings from Home Depot


Laid out with the trans/power steering hose


Installed


What are the fittings in the cooler inlet/outlet? They measure as though they are 3/8" pipe thread but don't appear to be tapered like normal pipe thread, and I think that is why they aren't sealing. Please help me get these to seal so I don't have to worry about my trans fluid going empty.

Also, why can I not find a sticky or archived post that shows the best way to remove and replace the line with the check ball?

Any help is very much appreciated.
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  #2  
Old 03-25-2014, 06:08 PM
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ramvan2500 ramvan2500 is offline
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Quote:
Originally Posted by LRS360 View Post
I just got the rebuilt transmission installed in my truck and have put 60 miles on it. I replaced the trans cooler line that contains the check ball with a straight piece. Unfortunately it's leaking at the OEM cooler. The top fitting is also leaking. I didn't install the top fitting; the previous owner did when they replaced the radiator.

Here is how I replaced the check ball line:

Fittings from Home Depot


Laid out with the trans/power steering hose


Installed


What are the fittings in the cooler inlet/outlet? They measure as though they are 3/8" pipe thread but don't appear to be tapered like normal pipe thread, and I think that is why they aren't sealing. Please help me get these to seal so I don't have to worry about my trans fluid going empty.

Also, why can I not find a sticky or archived post that shows the best way to remove and replace the line with the check ball?

Any help is very much appreciated.
Put teflon on the flares and tighten that flare fitting really tight!
I have a similar setup as yours, except I got my fittings from lowes :P Just kidding, mine are from home depot as well. I had a similar leak coming from the flare fitting.


The fittings at the radiator are NPT, the one from the transmission line and the transmission is a flare fitting (basically an AN fitting) but there is actually a small difference between AN and flare as far as the ASME has standardized the fitting. Anyways, the NPT are 3/8 and the flare's are 3/8th also. Flares are not suppose to leak but they do from time to time.

The line with the check ball is the one that comes from the front of the transmission (pressure line). The check ball is in the end of the fitting of that flex hose which connects from the hard line to the radiator. Oh, do yourself a favor and mount the external cooler as high up on the A/C condenser as possible, this ways gravity does the work that the check valve used to do.

I am going to go out and take a photo of my setup for visual aid. brb.
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Old 03-25-2014, 06:17 PM
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ramvan2500 ramvan2500 is offline
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Sorry about the image quality, I didn't feel like taking out my camera flash and having a photoshoot with my truck lol :P


I have had this setup for about two years or so, hasn't leaked since. I check the hose clamps from time to time of course. That flare fitting to the right of the image, the one from the hard line to the hose, tighten that fitting really tight. You may want to use one layer of teflon tape, I did initially but I guess I went back and took it off because I had figured that the fitting just needed to be really tight.

If you have any troubles at all do not hesitate to message me, I'm always happy to help.
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Old 03-25-2014, 06:20 PM
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Here's another, more from the side though.

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Old 03-25-2014, 08:52 PM
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Thanks man!!! At least I know I'm not doing something wrong. I'll try again with teflon on the flares.
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Old 03-25-2014, 08:57 PM
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ramvan2500 ramvan2500 is offline
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Originally Posted by LRS360 View Post
Thanks man!!! At least I know I'm not doing something wrong. I'll try again with teflon on the flares.
You're very welcome. I think just making sure the flare fitting is really tight is the key. It would make sense since it is essentially a compression seal.
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Old 04-03-2014, 01:17 PM
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Turns out the line I made wasn't actually leaking. The line above it was leaking so bad that it covered enough of the engine bay to make it look like both lines were leaking. I used Tru-Blu Pipe Thread Sealant with PTFE that I had left over from a propane line install in my house. It worked great. No more leaks.

I'm going to leave my pics up, so if anyone is looking for how to delete their check ball, they are welcome to use my method and parts list.

Btw, no transmissions were harmed in the making of this post.
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Old 04-03-2014, 07:19 PM
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ramvan2500 ramvan2500 is offline
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Quote:
Originally Posted by LRS360 View Post
Turns out the line I made wasn't actually leaking. The line above it was leaking so bad that it covered enough of the engine bay to make it look like both lines were leaking. I used Tru-Blu Pipe Thread Sealant with PTFE that I had left over from a propane line install in my house. It worked great. No more leaks.

I'm going to leave my pics up, so if anyone is looking for how to delete their check ball, they are welcome to use my method and parts list.

Btw, no transmissions were harmed in the making of this post.
wow. that is all i can say is wow.
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