On the stock transmission cooler lines in the radiator assembly. Is the top line the one coming from the transmission and the bottom the return line? Or vise versa?
Thanks,
Philip S.

 

I don't think it matters. Why are you asking?? If you are hooking up a trans cooler, just make sure that you hook up the lines the same.(ex. top hole on the trans goes to the top hole on the cooler and the same for the bottom.) Hope this helps....

 

I'm not sure.... Why are you asking?? If you are hooking up a trans cooler, just make sure that you hook up the lines the same.(ex. top hole on the trans goes to the top hole on the cooler and the same for the bottom.) Hope this helps....This is how I did mine. Never had any problems with it.

 

Holy Double post batman!


In other people's case, what if they didn't install their cooler in the same orientation? I put mine with the hoses pointing down.

From what I have read and understand, the top line was the return side

 

If you don't already have a cooler you want it on the downside of the radiator cooler. If not it will cool the fluid down then you would pump it into the radiator which would probably heat it back up since it will probably be hotter than an aftermarket cooler.

You could unhook the lines and start her up to determine which is in and out. Sorry had to.

Here is a quote from a web page I found on the subject. Doing an install on an F Body.

"Here is the layout of the lines as they exist in your car. Notice how the line coming from the tranny to the factory cooler has its rubber hose crimped to the metal tube and the return line going back to the tranny has a clamp? This makes this job VERY easy... almost as if this car was designed to have an aftermarket tranny cooler installed right from the get go... hmmm This brings up an interesting point. I have heard of some bypassing completely the factory transmission oil cooler in the radiator and using only their aftermarket tranny cooler. You do NOT want to do this in my opinion. The factory cooler will provide you an additional 30% more cooling so you might as well use it! So, the flow path will be like this: Tranny --> stock rad cooler --> aftermarket tranny cooler --> tranny."

 

See what had happened was.......... I needed to drain some coolant due to I over filled. I tried the drain plug in the trans. pan. It was on their so tight I stripped it out! . So I decided to take a hose off of my trans cooler. I needed the hose coming into the cooler. So I followed the hose and found it. BUT it wasn't the hose with fluid coming into the cooler, it was the one coming out! So I removed return hose (thinking it was the flowing hose) and pointed it in my bucket. Cranked the truck and fluid was squirting everywhere into the engine bay! It was coming out of the cooler. I removed the wrong hose. Then I looked at my hose set-up and I think I have it wrong. Yeah it's a little confusing what I wrote, but I just need that simple question answered please!
Philip S.

 

KYSilverado. Our trucks don't have the clamp as the F-bods do. I had to cut my hose and run it. Thanks for doing the research though But is the top one the return line or the bottom one?
Thanks,
Philip S.

 

Top line is the return

 

Thank you sir! Welp,have to rearrange some lines tomorrow. Now I can probably drive my truck with peace of mind now.
Thanks!!
Philip S.

 

Sorry for the double post, you know why your trans plug is so tight? My buddy at the dealership told me that they put lock tight on... I said WTF!!!!! Whats the point of putting a plug on their if you can't use it!!! I had to drain some fluid too(same situ...) and my truck was still under warranty so I took it to him and they R&R'd the pan and I told him to tell the tech to make sure I can use my plug.