Trans fluid change

[Rayme20]

How often would you all recommend changing the trans fluid on a tuned 16 sho with around 400 whp? I have changed the ptu fluid twice already at 45k miles.

 

[SHOdded]

Use the severe duty/service schedule as a guide. This is assuming you also drive the car like a performance car.
http://www.fleet.ford.com/partsandservice/maintenance-schedules/