I have a 2002 Dodge Caravan sport that the transmission went out on 2 days ago... My brother has a 01 Dodge Caravan that the head gasket is blown but the transmission is good are they interchangeable?

 

This is above my pay grade and any help is appreciated. Thank you all.

 

According to car-parts.com the 2001 and 2002 transmissions are interchangeable as long as both vans have the same size engine.

If one has the 3.3L and the other has the 3.8L engine the transmission will work but the final drive ratio is different, that can be corrected by swapping the the transfer gears (located under the side cover) between the transmissions.