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Old 07-26-2013, 07:57 AM   #1
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Transmission Line Size

The transmission cooler lines are leaking on my TJ, so I'm looking to repair/replace them this weekend. The leak is through the hard line (rusted right through) so I'm trying to determine the size....

I've searched, but everyone talks about leaks at the rubber line. Does anyone know the size of the existing hard line, so I can patch into it? My plan would be to bend my own lines and use a compression fitting, or double-flare if its a size I have the tool for...

Alternatively, if there is a fitting that fits into the side of the trans I could just replace the whole line... I got under there, but there's too much rust for me to see what type of fitting it is. I found a Mopar part that's listed as a quick-connect fitting for the trans....but it is threaded on the inside and outside so there must be another fitting on the line to thread into the Mopar part? This eBay sale shows a picture of the part I found through Mopar. I couldn't find lines (I'd buy them if its reasonable)
http://www.ebay.com/itm/310677769005?redirect=mobile

Anyone have any info, or done this themselves...?

2004 Jeep TJ Sport
4.0 I6 with 42RLE Auto Transmission

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Old 07-26-2013, 08:18 AM   #2
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I would go this route if it were me. http://www.summitracing.com/parts/hd...FUJlMgodhFIA6g

Take the steel out all together

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Old 07-26-2013, 08:30 AM   #3
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I would go this route if it were me. http://www.summitracing.com/parts/hd...FUJlMgodhFIA6g

Take the steel out all together
Are you sure those fit the transmission side? I thought the transmission fittings at the trans looked different than that...?
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Old 07-26-2013, 08:32 AM   #4
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the rubber hose is 3/8", and the hard line is 3/8" OD, IIRC.
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Old 07-26-2013, 08:50 AM   #5
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Originally Posted by workshop4ever View Post

Are you sure those fit the transmission side? I thought the transmission fittings at the trans looked different than that...?
No I'm not 100% sure as I don't have an auto.
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Old 07-26-2013, 09:02 AM   #6
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No I'm not 100% sure as I don't have an auto.
Ok. I think I might order them anyway and find out the hard way. The female one in the picture is what I thought looked off, but the description says the package comes only with 1 fitting, which has the male threads. So it might be the right part....
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Old 07-29-2013, 07:19 AM   #7
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In case anyone else needs the info, so far I've determined:


- Tube Size: 3/8"
- Fitting in Trans: 1/2" Male Pipe Thread, adapts to a dodge/jeep quick connect pipe fitting. Not being able to find a replacement tube with the quick-connect, I had to replace those fittings with something i could work with. I was able to pick up a 1/2" MPT to 3/8" Flare adapter at my local sears, along with some flare nuts. Then I just bent my own tube and put the flare on the end to mate to the trans...
- I could not get the trans lines out in one piece (without removing rusted exhaust parts) so I found a good spot to cut each in half, where I knew I could get a wrench up to and tighten a union to put them back together.
- I never found adapters for the rubber line to my new hard line, so for now it's just slipped on there and held with two hose clamps. I don't think it will leak, but I'm going to replace it with some AN fittings and braided line. I haven't verified the size of the fitting in the radiator, so I'm going to buy some different size adapters and find out later this week.
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Old 07-29-2013, 09:19 AM   #8
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The hard line part of the transmission cooler lines contains an antidrainback valve. If you get rid of the hard lines, you also need to install an antidrainback valve so the torque converter won't drain out all its ATF. That would cause the transmission to slip and make you think it is in Neutral as it slips/won't move the Jeep until the transmission pump can refill the torque converter.
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Old 07-29-2013, 10:12 AM   #9
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Quote:
Originally Posted by workshop4ever View Post
- I never found adapters for the rubber line to my new hard line, so for now it's just slipped on there and held with two hose clamps. I don't think it will leak, but I'm going to replace it with some AN fittings and braided line. I haven't verified the size of the fitting in the radiator, so I'm going to buy some different size adapters and find out later this week.
Transmission Coolers Accessories 3/8 Inch NPT Hose Barb Accessories and Parts | etrailer.com

Are you working on the 42RLE?
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Old 07-29-2013, 10:57 AM   #10
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Yes, 42RLE.

I was trying to find something like that locally yesterday, but could only find stuff online. If I'm ordering online, I'll probably just go with braided hose since the rubber lines are starting to deteriorate anyway....
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Old 07-29-2013, 11:10 AM   #11
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Quote:
Originally Posted by Jerry Bransford View Post
The hard line part of the transmission cooler lines contains an antidrainback valve. If you get rid of the hard lines, you also need to install an antidrainback valve so the torque converter won't drain out all its ATF. That would cause the transmission to slip and make you think it is in Neutral as it slips/won't move the Jeep until the transmission pump can refill the torque converter.
I didn't find any valves inside the hard lines..... Where along the lines would it be?
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Old 07-29-2013, 12:00 PM   #12
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Looking at the parts online, I don't see a drain-back valve anywhere in the diagram or even a spot in the line that bulges or has fittings. The factory part is one solid line from trans to radiator.

The fittings at the trans are the same part number for both the supply and return. Since the fittings both go the same direction into the trans, you'd never get flow if they were valved. So as far as I can tell, there is no drain-back valve on the 42RLE lines.

I did some google searching and found references to a drain-back for the 32RH, which doesn't run fluid in PARK leading to starvation issues if left running in park without a drain-back valve. However, from what I read, the 42RLE runs fluid in PARK and doesn't have the starvation issue...

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