Your CD4E tranny POS that mazda built is nutralizing in overdrive. Your in for some MAJOR problems. when this happens there is only a couple of things that can cause it.
The overdrive clutches are scorched and or the clutches are burnt . Or your overdrive solinoid is going bad. If you have a substancial decrease in mpg then the problem most likely originated in yout torque converter. Either way you have an internal problem. the best advice i can give you it to have the tranney scanned for codes most places will do this for free. BUT be carefull, these transmission shops are all crooks. I hope for your sake im wrong but i dont think so im pretty familuar with transmissions. Good luch dude.
98 LX, Eibach`s .... ICWrims / Potenza`s.... Svt kit w /duals... BASF Extreme Ocean paint( complete color change).... Bullit gas door.... Fuba DSM rear mount roof antenna.... Pre 98 trunk.... Blacked out headlamps, W/ Eyebrows.... A6 Side markers.... Shaved antenna and deck lid lock... 4 wheel disc brake conversion.... Magnaflow resinator.... SVT gauge cluster....(Yes the SVT gauge has a O/D light).... Complete mesh grill treatment, Not gutter guard.... Titinaum window tint.... Burgman custom Power window & lock conversion.... More to come as soon as i complete this one. Yeah its a LX but it has a 2.5 and it looks better then your ricer 
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