[Spridgets] Datsun Yoke U Joints

[Mark]

I was cleaning up some of my Datsun tranny parts and thought I would remove 
the piece of drive shaft still attached to the yoke.  The U joints are 
staked on with a ring instead of using a C clip.  How do these come apart, 
do I need to try to break out the staked ring?  Chisel?

On another note can I remove the rear shift extension to clean it up without 
parts dropping into the tranny housing?  I have the manual but it's not 
clear what happens.

Thanks,

Mark