You MUST identify your engine before you can accurately locate the crank sensor. This information is usually found on a sticker under the hood, or in your owner's manual.
Once you know the engine, a search like "2000 Chevrolet 2500 [Engine Type] crank sensor location" on Google Images will likely yield several pictures showing the sensor's location. You can also consult a repair manual specific to your year and engine.
Generally, crank sensors are located near the crankshaft, often on the engine block itself, but the exact position varies greatly between engine types.
