WHEN MY CAR GETS WARM, THE TRANSMISSION DOWNSHIFTS. SOMETIMES ONLY ONCE IN A WHILE, AND SOMETIMES SEVERAL TIMES IN A VERY SHORT DISTANCE. IT DOESN'T DO THIS IF DRIVING UNDER THE SPEED OF 35-40 MPH. i HAVE BEEN CHARGED HUNDREDS OF DOLLARS FOR THEM TO TELL ME NOTHING IS THE MATTER. I HAVE OWNED MY CAR 12 YEARS AND THE MAINTENANCE IS TIMELY AND UP TO DATE, EXCEPT FOR THIS PROBLEM.
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This may be a Crankshaft position sensor. Sometimes what happens with Ford and Oldsmobile is when the engine gets warm the crank position sensor loses its signal therefore not supplying a signal to the coil of coils to fire when they are suppose to.
use the first D. this is overdrive. it gives you the best fuel economy. The second D downshifts the transmission into a lower gear. this would be used when climbing a steep hill (it keeps the transmission from hunting between gears) or descending an equally steep hill as it would help slow the car without using the brakes.
yes you add yout fluid through your dip stick. go to your auto parts store and get the auto trans fluid for fords, yes there are several different types, ford and chevy use two different types. just ask for the trans fluid for a ford auto trans