Will a transmission out of 1991 3.3 dodge carvan fit into 1997 caravan?

No, a transmission from a 1991 Dodge Caravan with a 3.3L engine will almost certainly not fit a 1997 Dodge Caravan. While both are Dodge Caravans, there were significant changes in drivetrain and transmission designs between those model years. The bolt patterns, bellhousing, and internal components are likely different enough to prevent compatibility. You'd need a transmission specifically designed for the 1997 3.3L engine.