However, the exact location can vary slightly depending on the specific transmission type (3-speed auto, 4-speed auto) in your Grand Caravan. You'll need to consult a repair manual specific to your vehicle's year, make, model, and transmission type for precise placement. A diagram will be invaluable.
A visual inspection with the vehicle on jack stands (and appropriate safety precautions) is the most reliable way to locate it once you've narrowed it down with the manual. Be prepared for it to be somewhat difficult to access.