Is there an o ring or gasket between the oil filter housing on a jeep grand Cherokee Laredo 4.0 motor where meets block?

No, there isn't typically an O-ring or gasket between the oil filter housing and the engine block on a Jeep Grand Cherokee Laredo with the 4.0L engine. The oil filter housing itself is usually sealed to the block with a crush washer. This washer is designed to be compressed and deformed during installation, providing a reliable seal. It's a one-time-use item and should be replaced every time the oil filter is changed.