Additional bit of info, random or related, no idea?
I just swapped in a new motor that took me a year to get finished.
It's seems like forever ago, but OD worked before I started the engine swap.
But it's hard to remember, and most of my driving probably didn't require OD.
This transmission was a JY pull 7 years ago, and was completely rebuilt with Transgo shift kit.
It has run flawless for the last 7 years, and only has 15k miles on it since then.

So the transmission has been sitting (in car, in garage) for 1 year, and just randomly craps out when I take car out for first test drive with new engine........................