The 2000 Dodge Grand Caravan's transmission valve body is a complex internal component of the automatic transmission. It's
not a single part with one name, but rather a housing containing a network of valves, passages, and other components that control the transmission's fluid pressure to shift gears. The specific design and parts within it will vary depending on which transmission is in your Grand Caravan (e.g., 3-speed, 4-speed).
To find the exact valve body part number, you need to know your vehicle's specific transmission type. This information is typically found on a sticker on the transmission itself or within the vehicle's documentation. Once you have the transmission type (e.g., 31RH, 41TE, 42RE), you can then search online using that information along with "valve body" to find the correct part number and diagrams.