<VV> Gear lube level problem

[Smitty]

Smitty Says   This may have already been answered.  If so I didn't see it. 
On Early trannys including 65 There is a 2.5 diameter disc (gasket) under 
the fill port nut.  It says Transmission fill only.  Also says check fluid 
level at axel servicing plug.  Or some words to that effect.
This means to me that to service properly  you pull both plugs.  Then fill 
at the tranny fill hole till it runs out the axle service plug.  In other 
words the holes are known to be at different levels and you should not fill 
at the tranny without pulling the axle plug and not expect to top off at the 
tranny with the axel plug installed.