to those of you that think you can only put mercon/dexron III in these trannies.. know this. ford only specifies that fluid to make it easier to shift. mazda, whose tranny it really is, specifies 75-90 gear oil. the best is 5w30 snythetic motor oil. the mazda techs at work all told me this. and btw, there is a fill bolt on the side of the transmission.. its always been there.. above the reverse switch. you fill it there with a hose or whatever until the fluid reaches the hole and spills out a bit.