What temperature are you reading? If it's the fluid going to the cooler, max is 300. You will see a temperature sender in the fluid line going to the cooler. At 300 deg F, Dexron starts to break down very quickly. If you're reading sump temperature, like some World Transmission setups do, max is 250 deg F.
I agree with gts .. my MH runs lower 200's when pulling a hill with a toad ,, but most of the time around 180 or so on level road ,, ,,
Don't worry about it,, till it says ,, pull over ,, u gotta walk now ,, hey i'm JK :laugh: :laugh: :laugh: :laugh: :laugh: :clown: