I understand that when new fluid is exchanged into a one of the newer Ford Allison transmissions it must be heated in order to flow? What is the deal? How does it flow on a freezing morning? Does not make sense to me.
I have worked on trucks and cars for forty years and I have never heard of such a thing. You do have a choice between Dexron 3 or synthetic but you don't have to heat them. Syn. will take the heat ( heat from running) better then dexron and is probably a good idea. The change intervals will also entend with syn. It does cost a bit more so you have to decide if it is worth it. Good luck!