Do any of you guys have any methods on how I can flush my 99 Explorer's 5R55E transmission myself?

 

Some on this site have removed the trans cooler input line at the radiator, attached a hose and let the hose drain into a 5 gallon bucket with the engine running and addding new fluid at the same time. Search the site for better instructions. Don't forget the trans fluid additive from Ford, it does work. Good luck.