Hi, what are you calling high RPM ? The tranny will shift on different cycle depend on how you are driving. My car has 170k on it with the original tranny. From the day i brought it new in 02, the tranny has always driven with different cycle. Get yourself a Ford service manual. It will giving you the info you are seeking about the shift pattern for your car.
01 GT, True Blue,auto,CAI,CDC shaker,70MM TB,PP upper intake,PP Typhoon lower intake,21 lb injectors,Blue Hi-temp hoses,Steeda coil springs,Koni struts,stock sub-frame connectors,Flowmaster catback,Mach 1 delete grill