I took my radiator out and now I'm putting it back in.
There is coolant leaking around the transmission cooler input lines.

How does this fitting seal. Is there an o ring that I'm missing>]
What makes it seal at the radiator tank?

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No takers?

All I have left to get it back on the road is this leak

 

I've never dealt with this specific radiator... but all the ones i took apart in the past had an o-ring around the fitting... on the inside... of the tank where the fitting mates up to it.

 

Yeah, I've never had to touch the one on this truck at all...

powerstroketech87 would know, but he's not on here very often. I know he's on PS.ORG more often than here though... his name is different over there too.

 

Turns out ebecanezer was right.

There are doughnut shaped rubber gaskets that sit on the inside of the tank. The cooler is inside the tank, so you have to figure out a way to get these 2 gaskets positioned around the inside flange on the tranny cooler and then hold the cooler long enough to get the cooler hose nuts started without the gaskets falling down inside the tank. I think I passed the Houdini test. It's hard on the fingers, but I managed to get it back together.

I found the gaskets at a local radiator repair shop. The guy apologized for charging me $2 a piece for them....I gave him a $2 tip. After all, he saved me a couple hundred dollars over a new radiator.