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Discussion Starter · #1 ·
Good evening friends! I’m new here and it’s been really neat to look through the threads to see some of the cool mods and treats you’ve all given to your nitro’s! I hope maybe someday I’ll have an answer to some question someone might have. I apologize if it’s formatted strangely, I’m posting on mobile.


However today I am here asking for your help! My mother has recently passed down her 08’ Nitro R/T to my family as she purchased a bronco, reason being this little bugger included in the photo. It’s leaking what I believe transmission fluid from this line/connector here.

My current problem is I can’t narrow down what part this is. The closest I’ve gotten is the transmission cooler lines, however the ends appear to be much different than what is on this nitro.

Does anyone have an idea on what part this is? Maybe what kind of labor would be involved replacing this or leaving it to a shop? I’m pretty mechanically inclined so I’m not afraid to get in there.

Thank you for any help friends!
Motor vehicle Gas Bag Tints and shades Automotive exterior
 

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Discussion Starter · #3 ·
Yes, that looks like the transmission cooler line. That block that both go into farther down I think is the bypass valve.
I believe it uses standard fittings. I think that uses the typical "quick connect" fitting (which is not so quick to disconnect)--you need a tool like this.
I've never worked on those lines, so not sure if they need flares or what on the ends.

rockauto lists the lines.
stevewhite also.
amazon
google shopping shows some potentially cheaper sources. shop around.

looks like it comes with the bypass valve included.

You can search the forum to find the online chilton link (it's free)--should have full assembly and disassembly instructions.
hey 2nd, thank you so much for the reply! I’m looking through these links and I can’t help but think that these lines look different than all of those? It appears that after the bypass, all of those have multiple bends in the line, where as on mine, at least to me, it looks to be a straight shot with a 90° at the very end. Where they updated to a new design?
 

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Discussion Starter · #6 ·
Hey again friends! I've narrowed down the specific model I need for that cooler line. So my NAG1 transmission needs lines lettered AG

-> Hose 55037840AG | TascaParts.com

I actually can't believe how deep in sleuth I had to go to find this.

All mopar parts websites I went into listed this as the replacement, but all list it as discontinued and loop back to the 42RLE line as the replacement????? I could just be delirious lol

-> 2007-2011 Dodge Nitro Oil Cooler Pressure And Return Hose And Tube 55037865AH | Mopar Online Parts

Anyone have an idea on what this would call for, for labor? This looks like a nightmare to replace diy
 

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Discussion Starter · #8 ·
The part I listed for you, 55037841AK, shows fitment for both 3.7 and 4.0. However, oddly it says it's for the 4-spd 42RLE yet fits the 4.0 R/T (which has the NAG1).

Pretty much all mopar part numbers are <sequence><last two letters>.
The last two letters are the revision number, and for the most part are interchangeable.
When you see the part listing on the dealer sites it will say "replaces ..." and list all the lower lettered revisions--however they will usually still work in most cases.

The part number you showed 55037840AG, pulls up on stevewhite's site, but doesn't show any fitment info, but does call it "oil cooler pressure and return".

The second link you gave for 55037865AH also shows fitment for both 3.7 and 4.0.

So you've got 3 potential part numbers:
55037840AG
55037841AK
55037865AH

Both the 7340 and 7865 list as fitment for 3.7 and 4.0, the 7841 doesn't show fitment data.
Worst outcome is you get it and it doesn't fit and have to return it. Maybe a dealer can tell you which of the three is the right one--maybe email SW parts depart. and ask.
Hey man, I really appreciate all of the help you've given me so far. Never had such a hard time with so many different parts across trims and engines, you've been a life saver!
 
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