I recommend removing the shifter, torx bit (star head) after draining and cleaning magnetic plug, pour thru a cheap quart of ATF flushing out any thing left after drain.. as far as type of fluid, since 1992 I've owned 3 ranger's and 2 mazda's all manuals have had no problems using Mercon 5 transfluid, servicing every 50,000.... my '98 mazda had 286,000 when I sold it and its still on the road today, saw it yesterday..

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1999 MAZDA 2500SE, 2.5L 4-clanger, 5 speed, Green n slow. Rangers as daily drivers since 1988.
ASE Certified Mechanic, Builder of Show Destroying Protouring and Classic cars..