The crank position sensor on a 1998 DOdge Truck 318 engine is on the “bellhousing”. It is in the area where the transmission connects to the back of the engine. You will notice two small “hex” head bolts. (They might be metric allen head also) Teh crank position sensor sits inside the “Bellhousing” so all you will see is the two bolts on the top of that area. It has a wirs running up to the distribuitor. Actually ther are two wires one for the “CAM” positioning sensor wich is located inside the distribuitor, and the other one (wich is the one you want) connects to the crank position sensor.