Help me to identify this trans

I was just coming back to make a post, yes........3640081..........225..........727..........truck, long, heavy duty

Found here if that helps anyone else http://board.moparts.org/ubbthreads/showflat.php?Number=3220758

Heavy duty, does that really mean any difference over another 727, I ask cause I am going to have it gone thru, should I be getting a heavier set of clutch packs ect, maybe I need to clarify this with the re-builder

For $650 carry-in, he should include heavy duty clutches and a shift kit. My trans guy does for less....


My guy uses the "Blue Line Friction" clutches for me as they are heavy duty.