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There is a "loop" inside your radiator for the transmission oil cooler. If the cooler is leaking inside of the radiator, you will have a kind of funky sludge in your engine coolant. For what it costs to disassemble your radiator and replace the transmission oil cooler, you can purchase a new aftermarket radiator with one already in it.
On the front of your truck where your radiator is there is a transmission cooler,there are lines running from your transmission to that cooler they could be leaking, the transmission cooler is behind the grill on the front of your truck infront of your radiator, and as far as a stop leak, myself it is alot cheaper than buying a transmission, I would suggest that you use CD2 transmission stop leak, just a suggestion.
Your transmission fluid runs to your cooling system to cool the transmission oil. So, in answer to your question, one of the two transmission lines (one in, bottom and one out, top) could be leaking from the cooling system.
Bring your vehicle in for a cooling system pressure check. Another thing to keep in mind when inspecting leaks is that where you see the leak may not necessarily be where the leak is from. While the leak will drip down, the wind from when you're driving will splatter the leak all over the under-carriage of your vehicle making it look like leaks are happening where they in fact, are not.
The two trans cooler lines run from the trans to the radiator,they are routed along the engine block. If you can find which one is leaking you can cut the line and install a piece of 5/16 rubber gas hose and two clams to repair it.