Yes, or fill them until ATF starts to dribble out the fill hole. I drain them cold. I've used various methods of refill for the lovely 'bottom load' boxes; A clean, sturdy gallon jug, some hose and compressed air to force ATF out. A used gear oil bottle and a section of hose, squeezing as much in per load as you can. Like JB suggested, a funnel/hose setup works as well (beer bong). I've tried those thread on bottle pumps and have used trigger pump oil cans as well. You'll loose sensation in your hand from pumping those after the first 20min of torture.
Joel