* Engine Mounting: The engine mounts may be different. Even if the engine itself is physically similar, the mounting points on the chassis could be altered.
* Transmission Mounting: Similar to the engine, the transmission mount locations and bellhousing pattern could be different. The transmission might not bolt to the 2002 engine.
* Wiring Harness: The engine control module (ECM) and wiring harness are significantly different between model years. Adapting the wiring would be a complex undertaking.
* Computer Compatibility: The 2002's computer system may not be compatible with the 2005 engine and transmission. This would require significant reprogramming or a complete ECM swap, which often leads to other complications.
* Exhaust System: The exhaust system may not line up correctly.
* Other Components: Driveshafts, cooling system components, and other related parts might have incompatibilities.
In short, while some components *might* be interchangeable, the overall project would be a significant undertaking requiring extensive mechanical knowledge, specialized tools, and likely custom fabrication. It's far more likely to be easier and cheaper to rebuild or replace the existing engine and transmission in the 2002 Durango. You'd need a very experienced mechanic to even assess the feasibility.
