Diesel Bombers - transmission cooling

hey guys, when i installed the torqshift auto in my truck i punched a hole in the stock ford 6.0l transmission cooler. sad story because there really good. anyways i bought(2) 26,000 gvw coolers from jegs, they are truflex coolers. that combined should give me 52,000gvw of cooling. i can heat the trranny fluid up to hott temps quick. the torqshift runs 1/2inch lines, but the two coolers have 5/16 fittings, wich are small. i think its to restrictive and not flowing the fluid. what tranny coolers are you guys running? my brother bought the tru cool max 40,000gvw from dieselsite for his 7.3l powerstroke, and with the chip turned up beating on it, she nevers gets above 125*. im leaning towards that. if i can find another 6.0l cooler cheap