Help!! Tranmission Shifting in neutral
 

I've got a 02 protege 2.0. I've been having electrical problems with my ac and passenger power windows. The window doesn't seem to receive currents once in a while. The ac light doesn't light up at all but ac only works when the climate knob to circulate air is in defrost, legs, and legs and defrost only. Well recently the car will get up to about 35 mph and seem to shift in neutral then engine just revs. Unless I turn off the O/D off and use 3rd gear then I'll be able to drive pass 35 but revs or to high. I thought the transmission is slipping but hopefully not. Any help and advice!!! Thanks