i figured out where the missing oil was going....when the gears turn fast in the the box it was making the oil fill with air bubbles (simalar to what happens to whipped creame) ,makeing it less dence and making it exspand making a small amount of it come out the vent hole.

and when i cheacked it when it was cold the next day the oil was back level with the plug again...so im assuming it gos up inside the box more when its running and then comes back to the bottom after sitting for a while.

but it still seems hot to the touch...it just dosent seem like gears should get this hot just from moving fast. it probobley is what you sed lassie ...im just a little paranoied about it considering i just put 500$ into it... or maybe the oil itself is heating up from moving so fast and being "whipped" by the gears?