Those older TCUs don’t care. swap trans or front diff all day long. I think I’ve ran 4WD trans on FWD TCU. The old ones aren’t highly specific.
I don’t think the 4EAT and MT disassembly is worlds apart. Similar scope, concept, form factor, and basic tear down approach goes roughly the same. A guy on here swapped used AT front diffs - installed a good one into a bad one. Swapped all associated bits to retain preloads and backlash.