Nice post, I got 106,000 on the original auto tranny, and im due to change it next service. I get it changed every 15000 like you said, and it does make a pretty big difference. All you have to do is take care of your car and it will take care of you. Id rather spend fifty bucks to get my fluid changed every 15000 miles than pay 3000 for a new tranny, thats just me though.