Transmission Help

To add to that.

The MA904 (TF904 in a Dodge D50) used 4 & 5 Pinion Planetaries and a 727 23-Spline Output Shaft. Non-Lockup, Double Wrap Rear Band.
So how was the 727 output shaft matted to the MA904 ? Was the shaft resized (made smaller ) to fit the rear drum things splines ?... or was the rear drum thing's spline made larger so the 727 output shaft would fit ?
I'm trying to install a 727 shortie output shaft into a 904/998 . If that is even possible.
Also would the shortie 727 tail shaft housing bolt on to a 904/998 ?