Steering box questions

[Steven Ayres <comwest@well.com>]

I bought a couple of sets of spare front-end components for the Ghia, 
and found a steering box I think is in better shape than my original. It 
seems to be from a later year, however, with an "A" appended to its part 
number. What disturbs me is that instead of a square-drive screw plug 
for lubrication it has two plastic friction plugs, and on disassembly 
it I find it full of heavy grease. I always put 90wt gear oil in mine 
before. Have I been doing the wrong thing, or did they change specs 
along the way somewhere? What's best for lubrication? And for you real 
technoids, how do I conclusively determine which box is in better shape?

Steven Ayres, Prescott AZ
'66 KGhia 1600