Allison trannys are pretty stout and these days pretty self-protective. If you have Transynd fluid then that’s even more protection from overheating.
When reading others’ tales I see all kinds of temps being tossed around. It varies because everyone drives differently, have different radiator setups, different loads, different radiator cleanliness, and different fluids. And they may read the temp from different sensors at different drivetrain locations.
Allison would likely tell you that 170-205 is normal, at 230 have it checked if that stays a consistent number, but don’t fret much unless it approaches 250. Even then Transynd would protect things.
Joel