Transmission line flow direction?

[Turdle]

I'm trying to install a second trans cooler and will be using an in line filter to couple the 2 together.
The 2 lines come to the rad support and are clearly separated. one is more to the driver side.

Could someone tell me please, which one is the return line? Thanks!

 

[Turdle]

I think I found it

Yes, it just uses an oil filter. I found it easiest to come off the hard lines where they turn into hoses.

On mine the line on the drivers side was the pressure line, I went from there to the in side of the filter unit and from the filter back into the aux trans cooler.

 

[red.EDDIE.4x4]

take off both rubber lines then just have somebody start it (stand back, that fluid is like a rocket!) and as soon as it starts kill it.
thats how i did it...little redneck i know. maybe not the cleanest or best way but it does work!