5.9 magnum automatic crank

This is how I see it, I could be wrong.... I haven’t dissed this bridge yet. I may since I have the parts all here. A 833 OD and a 5.9 Magnum sitting to the side waiting for the day to come.
Hopefully I won't have to worry about it and my crank will already be cut lol.
If you cut the transmissions input shaft down, it is no longer long enough for the crank that is properly drilled to receive it. This making the input shaft a Magnum trans only?

The bearing still sits in the crank at the normal spot.

This may not be the case.
Without a diagram, I’m a bit behind the on this.

I do see 5/8th’s as a lot to cut off the input shaft.
Hopefully I won't have to worry about it and my crank will already be cut lol.