The change should have been the 99 model year F-250, F350 Super Duty trucks. That is when they went with the D-50 monobeam and in the F-450, F-550 when with the "Super 60" for the 4x4 front axle. This is also when the lug pattern went from 8x6.5" to 8x170mm, and the rear axle got disk brakes with the e-brake in the rotor hat.
I know for a fact, the rotors on the Front D-50 and the Rear Sterling 10.50 on my Excursion slide off the lugs when the caliper and caliper bracket are removed.
There was also a change in 05 I believe, when they went to even bigger rotors and a larger wheel. My 03 has 16" rims factory and I think they have a 17" or even 18" factory rim.