2004 3.5 engine swap to 05 or 06 engine?
 

I need to replace my 2004 3.5 and the 05-06 are more readily available but salvage yards say they aren't the same. Does anyone know what is different and why the 04 won't take the 05 engine swap?

04 and 05 are different body styles if u tear it down to block and heads the engine can be used u cant just drop in the 05 to the 04

Thanks and one more question
 

Thank you so much for your response, I have to just get clarification, as long as I swap all external components like fuel and exhaust systems and any related sensors it will work? Do you know if oil pans are the same? Thanks again

your oil oil pan will be needed

I have a question
 

I just bought a 2004 town and country the the previous owner swaped the engine to a 05 and the egr dose not have a Connector for the wiring to connect the egr

that's because in 05 the egr was deleted you will see a cover where the EGR was suppose to be.