Did some more research. Toyo Kogyo is made by Mazda. So they are one in the same.
Found this in the tech library
"Well, that depends, if you have a 2.9L Ranger with the Mitsu FM145 Manual trans, the 4.0L will bolt up, but there is not much telling how long it will hold. If you have this trans, swapping to a Mazda M5OD from another 4.0L Ranger is your best bet. If you have the Toyo Kogyo 5sp (86 and 87 2.9L's, mostly 2wds) this tranny should be able to handle a 4.0L, and unless you really, really want to, a swap to a Mazda M5OD is not needed. As for the A4LD, it’s a gamble, since it’s not the most reliable auto in the world. However, they were put behind 4.0L's from the factory, so, its your choice."
And this:
The TK4 has a pretty wimpy reverse. The tk5 is better. I beat the crap out of a TK5 behind a 3.0 in my offroad truck. It has never given me a problem.
I rebuild manual trannies. The TK5 is quite comparable inside to the Mazda.
Sounds like the advantage of an M5OD swap plus more driveline space and a slightly lower gearing.