How many gallons of anhydrous ammonia are in one ton?

These old fashioned units are used only for confusion. The recommendation is to use the SI.
The US "ton" is 907 kg.
The US gallon is 3,785 L.
The density of pure liquid ammonia (NH3) is 681,9 kg/m3.
So, 907 kg contain 1 330,107 L; and this volume is equal to 351,415 gallons.