I'm just finishing up putting a new Griffin cross flow aluminum radiator in my 66 Bel air. Now I know that the transmission fluid flows out the bottom fitting on the TH350 and back into the top fitting, but which way are they supposed to go into the cooler in a cross flow radiator?

I've been looking over a bunch of different forums and they all say different things. Some guys are saying that you have the fluid flow from the transmission to the bottom fitting on the radiator, then out the top of the cooler and back to the transmission. Some guys are saying that you route the fluid out of the transmission to the top fitting on the radiator, and back to the transmission from the bottom fitting on the radiator. The cheapo aluminum radiator I had in there before was a down flow, so the cooler just flowed side to side.

So what do you guys think is the correct way??