I had my trans. flushed (car in sig.) at 50K. The dealer dropped the pan and changed the factory filter out and cleaned the pan/magnet and flushed/filled with MaxLife Dex/Merc. I am now crossing 77K and I have a stash of Valvoline Mercon V I am itching to get in there. I will be taking it in on Friday for the service. Do I just get a flush this time or do I go for the whole shebang again? I have been told by several different people that most ATX filters are rock catchers and it would be $$$ wasted to change it at 27K.