Trans return line size

[jesilvas]

Was wondering what the size of the fittings are on where the return line goes into the back of the transmission. I read somewhere that it was 3/8" but I wanted to ask you guys too. I'm gonna try to get my own external filter setup put together.
And also, do you guys know what pressures the 4rs run? Isn't it about 40?

[DJM]

Yup 3/8 I just did my 6.0 trans cooler and that be the size

[OregonStroker]

make sure you get the 1/2 inch to 3/8s barbed adapters and about a foot of 1/2 inch hose. the lines have room to poke straight down thru the bumper and makes for easy routing of lines. Put up a pic of your external filter set up when your done. Are you gonna mount it up front somewhere?

[jesilvas]

Not sure where I wanna mount it. I was thinking of doing something like Dieselsite's setup and tap into the return line at the back of the trans but that'd require threaded flare fittings and such. I think I will just tap into one of the rubber hoses. Less fittings. Haven't really thought of where to do it yet though. Just brainstorming right now.

[OregonStroker]

There might be room on the frame rail passenger side. need some sort of bracket.

[jesilvas]

Oh making brackets isn't a problem. Just need to look around for where to put it

[CT Performance, Inc.]

Not a good idea to run a external cooler unless you keep a eye on fluid volume. I'd watch your trans temps also.

[OregonStroker]

ya i was thinking about that. prob robs flow.

[jesilvas]

An external cooler? Guess you mean filter right.
And of course you compensate for added volume of fluid. Already got gauges.
Why would a filter rob you of flow?

[DJM]

Just my experience I had the diesel site trans filter and my tranny ran hotter don't ask why it was just my experience took it off and they went down a bit that was all before I installed the 6.0 cooler.