we had a tranny go out on one of our 2011 F-250 6.2/ It had 52k miles..... didnt tow a lot with it but did have some heavy payload from time to time. dearlership said to check the tranny fluid often as they have had a couple get low on fluid and have failures. Im not sure if there is a dummy light come on or if you just have to check the trans temp from time to time on the lcd screen.........