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Its basically taking your last gear away from you. There really isnt ever a reason to not have it on.
Maybe the auto's are different in the Mach, but when drag racing it is recomended that you turn the O/D off, going into 4th at high rpms can stretch the bands.. some have been destroyed using the nitrous and forgeting to turn off the O/D.
Other than that i agree there is no reason to turn it off.
....im so lost so i always have it off cuz wen i hit the overdrive button a greenlight pops up on the dash so does that means its on or off im so fukin lost