Technical Early Ford Three Speed Issue.

I notice yesterday my coupe transmission shifter became very stiff to move between gears when it was first started. After it was in the road the stiffness left. The tranny oil is topped off every oil change. I do use a heavy gear oil. 60weight. The temp was 70 outside during this start up.
Haven’t had this problem for 20 years on this tranny. It went into gear just fine during this stiffness. Any ideas?

 

Someone out there has to have a stiffness issue so hopefully this will help get it raised.

 

20 years ? - man that's a good run..........

 

Oh my. Yep after twenty years gravity seems to take over.