by the way: 87 4.0/AW4/242. its just exactly what it sounds like. i was sitting at a light and there started to be a huge smoke cloud. it wa smy rig. i pulled over quickly and looked underneat. oil was pouring out, not dripping. it was coming from the cover that conseals the flywheel. I know theres no oil in there but that is where it was xcoming from. after i shut it off, the oil leak started to slow a little but not much. everything under my rig is soaked with oil. the inside of the rear tires and everything. I had the rear main and oil pan gasket replaced in Febryuary. and valve cover asket is about a year old. my valve cover (on top) always has leaked a little, but its minor to give you an idea of how bad it was, i ran out of oil (about 4 quarts) going just ten miles. what could this be?