Since no one else has answered, I'm going to take a stab at it from my experience with a 4400.
Been over 20 yrs since i was in there. Yes, it is a stub shaft that fits in a cast iron (I think) hub and is retained by a heavy press fit and (I think) a roll pin. Took some serious heating on the hub to get the shaft to slide in loose enough to put in the roll pin.
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