You will have to ask the professor on that one. Also check with places that advertise as building them. I've been messing with Nissan surplus which included new transmissions. Most builders want newer models because few people are willing to repair the older models. Many of those that want an older tranny want it cheap.

The older stuff almost has to be retailed to get any money out of it.

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85SD 240K & stopped counting painted, putting bac together. 84SD 180,000. sold to a neighbor and member here but I forget his handle. The 84 is much improved from when I had it. 85TD beginning to repair to DD status. Lots of stuff to do.