How To Check If Transmission Is Bad. Connect the headlight and the resistor in series with the 12v car battery. Move back to park and recheck the transmission fluid level.
A bad transmission mount can be dangerous because the transmission of your car can slip or even fall. Bad torque converters can cause friction damage, transmission fluid degradation and even overheating. The rest of the transmission fluid is in the torque converter, lines, and cooler.
If your vehicle feels like it’s trying to change gears on it’s own and you can’t stop it, that’s a classic sign of a bad transmission.
Car does not start or cannot move. For transaxles, you can find the speed sensor on the long side of the output shaft. Check transmission fluid level with engine off. 4 signs your transmission is failing.