D-type OD... are those grease ports? and lubrication?

[Steve Myers <mountainunicycle@yahoo.com>]

I have a D-type OD in a 72 GT6. Anyone know if those little 
grease-port-looking things are grease ports on a D-type OD? (you can 
see the top of a little ball through a hole, like a grease port)

Also, is there a separate plug to drain the OD portion of the tranny, 
or is draining the main transmission sufficient? When refilling, I 
think I just refill through the transmission fill hole?

I couldn't find anything definitive on these in my workshop manual.

Thanks!
Steve
71TR6
72 GT6