Will a transmission from 1997 Plymouth Grand Voyager 3.3 interchange with 3.0 1998 Chrysler Caravan?

It's unlikely a direct swap will work without significant modification, if at all. While both are Chrysler products from a similar era, the 3.0L and 3.3L engines have different torque outputs and potentially different bellhousing bolt patterns. This means the transmission's input shaft may not mate correctly with the engine's crankshaft.

Even if the bellhousing bolt patterns match (which is not guaranteed), the internal gear ratios and overall gear ratios of the transmissions could be different, potentially leading to problems with speedometer accuracy, shift points, and overall drivability.

In short, while some parts *might* be interchangeable, a complete transmission swap is not a simple matter of bolt-on replacement. You'd need to verify compatibility through detailed part numbers and potentially consult a transmission specialist before attempting such a swap.