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That smaller radiator in your first photo is your external trans cooler. The top hose is the outlet from the cooler back to the trans pan...ie. the return line you're looking for. Flow goes in the bottom of the external cooler and out the top. Pick up some 3/8" ID tubing, (HD/Lowes/etc), connect it in place of the top hose route to a bucket, and you're good to go for a cooler line flush.
The radiator sandwich front to back is, external trans|a/c|engine.
The full path on the V-8 is trans-> top passenger side of engine rad for first trans cooler in the engine rad->bottom of engine rad->under engine rad to driver's side->bottom inlet on external trans cooler->top outlet trans cooler->vertically down driver's side and back over to passenger side->back to trans pan.
-Brent
Exactly what I needed to hear riverwolf thanks!!!
Do you think I should drop the pan and change the filter as well?