Disassembling an FM146 is like disassembling one of those wooden chinese puzzles.
(Only it's a japanese puzzle made of aluminum and steel.)
everything must be done in an exact and precise order
Then because you don't have the special dummy bearings to check end play and such you get to take it apart and put it back together (often several times)
Parts are not easily available, and when they are they are pricey.
Generally speaking it's often easier to switch to the OTHER transmission used in Rangers from 88-on, The Mazda M5OD-R1.
There are multiple topics discussing the details of swapping out an FM146 for a Mazda you can read on the forums.
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