OK so I gotta get ready for another workshift, so Im done for the evening.
So far I found all 5 parts of the detent system, and so the side case is back together.

Meanwhile the side cover gasket is in pieces. Would Hylomar work OK or do I need to use cork?

What gear lube? Might as well replace what I drained. FSM says 140 wt or 90 if cold weather causes stiffness. How would ATF 4 affect things? I have plenty