Muffins

This is a really great writeup, I will be doing this for sure, thanks!

TINMAN080

My cooler is for a 26,000 lb gross vehicle weight. It covers my condenser completely. I've had it in for a year, NO problems or issues. The a/c still cold as ever, the engine temp hasn't changed at all, and the tranny Likes it....

fireman182

Hey all!
I too will be doing this mod. I added some flow directions to the photos. For the less mechanically inclined like myself it may prevent some poor plumbing haha. Can someone confirm that I got the photos correct?

BNE_JK

think you got it wrong way around, the upper line is feeding back to the trans from the stock cooler.

RedneckJeep

Yes. The upper line is the transmission TO cooler line. The lower one is the return. I can confirm because I have an auxillary cooler on mine, and the upper line is the one I cut and reflared to tie in the new cooler. I used the lower line in the system unmodified. Here is the link to my install with hard lines.

https://www.jk-forum.com/forums/jk-write-ups-39/trans-cooler-hard-line-install-58529/

I am just old school. I don't like a lot of rubber hose in the system.

EDIT: Please accept my apology. It has been a while since I made this mod. The TOP line in the transmission is the RETURN line, not the supply line, like I said above. You need to use the RETURN line because this still incorporates the factory cooler in the system FIRST, which is the best way. I apologize again for my mistake. I'm not a good artist, but if you need a diagram of how to run the lines, I'll be glad to scribble somethin up.

JIMBOX

I've been using the same thing, ultimately

IT DOESN'T MATTER WHICH LINE YOU USE

The xmission oil, doesn't know any difference, when using an aux. cooler !!!

JIMBO

Rhino64

The top line is the cooler return line to the trans and it does matter, you want it to pass through the trans cooler last.

BNE_JK

here is a snap shot from one of 42RLE's technical supplement docs.

JIMBOX

The important thing is to followthe MFG info !!!!

The Xmission oil doesn't care if it's going thru the PRIMARY or AUX cooler first, BUT

You have to make sure the oil flow direction, is from the top of cooler down

Some coolers MFG show the AUX cooler mounting, so oil flows side to side

Just follow the MFG sayso !!

JIMBO

fireman182

Ok I changed the photos.

Based on all the info here this should be correct!

I found the write up confusing as to which direction the lines flow.

Thanks for the help folks