To be certain, you should:
* Consult a repair manual specific to your truck's engine: This is the most reliable method. The manual will have diagrams showing the exact location and how to access it.
* Use a vehicle-specific online diagram: Many online auto parts stores (like AutoZone, Advance Auto Parts, etc.) allow you to enter your vehicle's information and view diagrams of the engine.
Without knowing the specific engine in your 2001 Dodge Ram 3500, providing a more precise location is not possible. Referencing a repair manual or online diagram is crucial for accurate identification.