th400 fixed yoke or slip yoke?

[Greasey Harley]

so here's a pic of my current setup.
transmission has a fixed yoke to a solid shaft that goes through the carrier bearing.
rear shaft has a slip yoke up front then down to the rear end.

Obviously, it is simple to shorten the front shaft and install a fixed yoke to the trans.

its not that much harder to delete the entire thing and have a 1 piece driveshaft made with a slip yoke to the trans.

I guess the only thing I really want to know is;
Which way would it have came if it had a TH400 from the factory? (it's a 6' bed)