sounds like a good plan. you can use sudt in the front axle, but I've read threads where folks say gear oil is also ok and may have some benefits. I use sudt for simplicity (always have some around).
refilling the trans fluid is a pain due to the fill hole location and angle. there are some threads on how to rig a solution. best I recall, I used a flexible funnel and wire and a lot of grunting lifting 5 gal buckets of sudt. I think next time I will buy a small transfer pump. others say it makes the job simple and I seem to be seeing other uses for a pump. they're cheap from what I've read. should save a lot of time and oil spills.
also, be sure you get the new sudt2 when you change fluids. I think most dealers have this now, there are threads on it. I still have the 'old' sudt but plan to switch to the new at next fluid change. I don't like to mix fluid types, even if it's ok to do so.
I also assume you have the dual element air filter. the inner element is an emergency filter in case the outer one fails. you don't have to change the inner, but I did when I bought the tractor.
I also flushed the radiator. it was clean, but at least I know it was clean. if you do it, it can wait until you're in the mood.
one last little thing, get a turning knob for the steering wheel if it doesn't already have one. cheap but makes a big difference.