piston questions

Like how my wife is bugging me to put the new trans i have here for the 01 Durango into it, even with its 314k miles on it already cuz she doesn't care for the 03 I replaced it with /that has a better body and so far still well under 1/2 of the miles of that 01....
That 01 Durango was the vehicle that the failed 360 was overhauled for in the first place.