* Engine Bay Size: The Neon's engine bay is significantly smaller than that needed to accommodate the larger V6. The V6 would simply not fit.
* Mounting Points: The engine mounts, transmission mount locations, and overall engine placement are completely different. There are no readily available mounting solutions to adapt the V6 to the Neon's chassis.
* Transmission: The Neon's 5-speed transmission is not compatible with the Sebring's V6. You'd need a compatible transmission from a Sebring or similar Chrysler vehicle.
* Wiring Harness and Computer: The wiring harness and engine control module (ECM) from the Sebring are entirely different and incompatible with the Neon's electrical system. Adapting the wiring would be a massive undertaking, requiring significant custom work.
* Exhaust System: The exhaust system from the Sebring won't fit the Neon's chassis.
* Driveshafts and Axles: The Neon's axles and driveshafts are not compatible with the V6's power output and transmission.
In short, this swap is practically impossible without a massive amount of custom fabrication, engineering, and expertise – far beyond a typical weekend project. It would likely be cheaper and easier to simply purchase a vehicle with the desired engine. The cost and effort involved in making this swap work would far exceed the value of the resulting vehicle.
