The EGR valve on a 2000 Dodge Ram 1500, 2500, or 3500 is located on the intake manifold. However, the exact position can vary slightly depending on the engine (e.g., 5.2L, 5.9L, etc.). Generally, it's on the
rear or passenger side of the intake manifold, often near the throttle body. You'll likely need to look at the intake manifold from the top or side to find it. It's usually a small, rectangular or cylindrical component with a vacuum line connected to it.
Because of the variations depending on the exact engine, using a repair manual specific to your vehicle's year, engine size, and model is strongly recommended. A visual diagram in the manual will show you the exact location far more accurately than a general description.