727 yoke wont come out. What's the trick ?

It "should" just pull off. It's either rusted, or years and years of abuse from the mass of a ship of a motorhome have damaged the splines. You may have to drive it off.

On your example with the nut retained yoke, all you've done is move the slip yoke function to a component in the drive shaft. This may or may not be better LOL

I can't tell from your tail housing, "what you have" So far as I know there is only one long shaft 727.