Towing, hualing, low speed rough terrain, or manual shut off for more power at higher speeds. When all else, its all right to leave it on. The PCM will pretty much decide when to use it. And with enough right foot pressure, it will automatically down shift out of it.
When hualing/towing, my rule of thumb is not to use OD when hauling/towing exceeds cargo capcity of vehicle. So that would be 1,250~1,500 for the Ranger.
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