It's time to get the transmission fluid changed on my 2002 Explorer Limited. It now has 100K miles on it. I was curious to know a couple things about getting a transmission fluid change job done: 1. What is the cost generally? 2. The filter gets changed but anything else other than the fluid? 3. Do I need to look out to make sure the fluid change is a "REAL" fluid change that includes a backflush or complete flush or is a fluid change on these things pretty much standard regardless of where you go?