I did the same thing, except I was there looking at it. It was a 1984 Bronco II with a bad transmission. I would price it as if everything was bad, engine, frontend, etc. I got it for $550, but still had to repair the driver's floorboard, and do some engine work also (waterpump was bad, radiator was bad). It had the Toyo Koygo 5 speed in it (4x4). I looked on this site and they said all the different 5 speeds were different lengths, but I had a 86 ranger with a Mitsubishi 5 speed, and a quick measurement with the tape told me they were very very close.
I went in to do the swap, making a lot of assumptions. But it bolted right in place. The 84 and 85 were oddball, so I had to use the flywheel from the 86, and also the throwout bearing and clutch master. It all bolted right in place. The Mazda M5 tranny is the one everyone wants, but this Mitsubishsi gave me good service in the pickup and now in the Bronco II.