When I should change my automatic oil transmition on my pacifica 2004

It will be good to have the transmission fluid changed around the 60000 miles clocked on the vehicle.
When doing so it is good to change the whole fluid and not top up as it will give more life and reduce noise of the drive.
Oil eventhough if not used has a life span for the lubrication and so a time limit also must be seen if the 60000 is too long.

Every 50,000 miles if not towing or in dusty and hot environment,if towing every 30,000 miles