Dave,
Been there done that. Looks like you are making good progress on the rebuild.
It is interesting to note that we are both in Norcal (I am in Ovale), too bad our B21's didn't break down around the same time.. Could have compared notes.
So far my b21 is running solid after the rear-diff rebuild (about 60 hours).
Just make sure you get the
HST pedal return spring on before you put it all back together (I forgot and had it all back together before realizing).
Cheers -Lucas