just lifted the front end of the car up to drain the radiator to put in the royal purple coolant additive in, then i noticed the trany fill plug was missing!!!! so i drained the trany fluid and there was about a quart in there. very low i put in mt-90 redline and the trany is shifting so much better a lot less noise,my question is could i have messed something up or did i?how the hell did it fall out ?