will a faulty shift control solenoid cause my town car to slip out of 4th gear and back into 3rd?I experience this on my car after reaching a city speed of 40mph and highway speed of around 55mph.Otherwise my transmission gear shifting is just fine.This has been going on for about 30,000 miles.I do not receive any codes at all and this was explained to me as if 3rd gear was operating ok but 4th wasn't the computer is still reading everything as ok.Do I need to replace the sensor to rectify this situation or do I need a complete transmission rebuild?I drained the transmission fluid by hand as well instead of by machine(including torque converter).The old fluid was not bad but I replaced it anyway after driving on it for 50,000 miles.
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