Shoot the transmission or better yet get a wire and command the overdrive itself to come on. But before you can do this look at the transmission fluid is it burnt or very very dark?And when you check transmission fluid level(car running) is it foaming or you see little bubbles.If you do shoot the transmission. Okay now check throttle cable or TV the one on the throttle body youll have 2 of them with is at wide open throttle take hold of the transmission downshift part does it have 1/4 freeplay it should cause that can affect the downshift.which in turns affects the overdrive. Now lets get to the dirty part in order for this transmission to have over drive. 2 solenoids signal must be in the off postion when the vehicle is in fourth gear . Your not slipping right? Now there is a sensor called O/d direct speed sensor(NC2) it detects rotaion speed of the clutch drum. all this does is detect shift timing by comparing NC@ sensor signal to the VSS vehicle speed sensor. this is the one on top of the transmission its called an input sensor or turbine. Now is the overdrive working yes it is does it feel like it works nope.when you turn on the overdrive and the O/D light is on its only transmission shift quality you only have 4 gears your transmission is a A541E 4 -SPD. Its working fine stop thowing part into it and dont shoot it.
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