67 driveline problem

[Teashas68]

Hey everyone, new to the forums but will be getting lots of information and sharing what knowledge I have. I am currently working on my daughters 67 coupe doing a restore with her. I ran into something interesting. When we went to remove the drive line it seemed as though the Yoke is stuck in the tranny. Most other vehicles the yoke will slide right off the spline. Am I missing something? It is a stock straight 6 with a C3.

Thanks for any input.

P.S. I fat fingered the user name and it should be Teashas67
Oh Well.