61 Drive 1pc shaft ?

[Surfdaddy]

I was working on the seals of my Hydromatic and had to pull the trans out. I never looked at the drive shaft until then, but I found that it’s a single piece drive shaft without a slip yoke on it. The output yoke on the trans did not have a bolt and washer on it and there is a tapped hole which looks like maybe a 5/16 or ½ 24 screw. It looks like has maybe 2 inches of movement on the yoke but I’m sure it would was not designed to move. On all my other trucks from this time (63 GMC ½ ton and 64 Carryall) I always had a 2 pc drive shaft with a carrier bearing. But this is the first I have seen a Hydromatic and don’t know if it’s wrong or not.