Aux Transmission Cooler Plumbing

Don't know how much this matters, but I've searched to no avail.

I've had my aux transmission cooler installed on my 2020 for a few years now and no hiccups. I've even taken it on two 550 mile trips in the summer and winter since then.

Didn't even read the installation manual until I got bored lol. Install was pretty straight forward so I figured I didn't need it.

Here's my truck with the old GCS kit and the MHX-514 cooler. I liked the look over the Setrab, so I went this route when it was still available to purchase.



But I came across this diagram saying that the hot fluid should be plumbed to the bottom port and cooled fluid that returns to the transmission should flow from the top. Hoping any transmission experts can chime in so I can determine if it's even worth it for me to swap the lines and get a little messy from a little transmission fluid.

Here's the diagram



The cooler is oriented as seen on figure 1. My logic while doing the install was hot/inlet=top port, fluid gets cooled, then cold/outlet=bottom, then goes back to the transmission. Aside from the potential "aeration" or possible air pockets in fluid, does it REALLY matter that it's not plumbed in the prefered way, given the flow rate of the transmission fluid and ensuring the fluid level is correct?

 

From everything I’ve read on coolers it doesn’t matter at all. Every one I looked at claimed it could be mounted any orientation. I mounted mine with in and out facing down, which should be worst case for bubbles, and had my hands on it as it warmed up for the fluid level check. I could feel the heat spread from the inlet corner, up across the top, and down to the outlet. My guess is the channel width and fluid viscosity combine to push all the air through, rather than keeping a bubble in there. I’m confident your installation is fine.

 

Appreciate this. Thank you sir. Saved me a day lol.