Air shifter is an awesome way to go as well. Sorry you were talked out of it. I’ve only seen more consistent shifts with my air shifter and others who I race with. It’s pretty simple. I’m shocked others have had issues. Make sure the co2 bottle is full and doesn’t leak. Ensure it’s set between 110-120psi. Ensure the trigger mechanism is wired properly and set up correctly. Works like a charm. We are installing an air shifter in my dad’s roadrunner this winter using his turbo action shifter and biondos co2 setup. Can’t wait.
Powerglides have the luxury of being able to shift electronically with no worries of co2. We don’t have that option with a 727 to my knowledge.