* Engine Mounts: The 5.7L Hemi has different engine mount locations than the 4.7L. Custom engine mounts or significant modification to the existing ones will be necessary.
* Transmission: The transmission compatibility depends on the year of your Ram. You might need to swap the transmission as well, which is a major job in itself. The 4.7L often came with different transmissions than the 5.7L.
* Wiring Harness: The wiring harness for the 4.7L is not compatible with the 5.7L Hemi. You'll need a 5.7L harness, or extensive rewiring.
* Computer (ECU): You'll need the appropriate computer for the 5.7L engine.
* Exhaust System: The exhaust system will need to be modified or replaced to fit the 5.7L engine.
* Driveshaft: The driveshaft may need to be modified or replaced depending on the transmission used.
* Cooling System: The cooling system may require upgrades to handle the larger engine.
In short, while it's *possible*, it's a complex project requiring significant mechanical knowledge, specialized tools, and potentially a considerable budget. It's not a project for a novice mechanic. You're essentially rebuilding a significant portion of the vehicle's drivetrain. A professional mechanic specializing in engine swaps is strongly recommended.
