Ok quick update for y’all. Took a bit longer than I (we) thought to get the trans back but ultimately the converter, or more specifically the lock up clutch in the converter was the problem. Had to have another custom converter made. Same specs as the old one, lock up, tight 2800 stall. The clutch “turned to dust”, his words not mine, and went through the whole trans. So a complete rebuild of all the soft parts, a gasket and seal kit, both solenoids, and a new converter. The trans is on my garage floor waiting reinstall and that’ll likely happen this weekend.