I've been putting in nearly a quart of gear oil every time I check the fluid every couple hundred miles. I look for oil under the car every time I stop and see a few drips at most. It must be splashing out somewhere when the gears are turning as the car is in motion. The front bearing has a drain back system. The drainback hole may be plugged or the bearing retainer gasket is missing? I don't think thats all it is because this is a lot of oil disappearing very quickly. Not a slow leak. Its running out somewhere.