Will a 2005 4.7 Dodge Ram motor fit into 2002 1500?

While both are Dodge Ram 1500s with a similar engine bay, a direct swap of a 2005 4.7L engine into a 2002 1500 isn't a simple bolt-in affair. There will be compatibility issues. The specifics depend on the exact engine codes (look for a code stamped on the engine itself), transmission type (automatic or manual), and various ancillary components.

Here are some potential problems:

* Wiring Harness: The engine harnesses are different. You'll likely need to splice and adapt the wiring, which is a significant undertaking.

* Computer (PCM): The 2005 PCM is incompatible with the 2002 system. You'd need a 2005 PCM, and even then, you might need a custom tune or modifications to make it work correctly.

* Sensors and Actuators: Sensors and actuators might have different connectors or configurations.

* Exhaust System: The exhaust system might need modifications or replacement to fit.

* Mounting Brackets: While generally similar, minor differences in brackets could require adjustments.

* Transmission: The transmission needs to be compatible. A 2005 transmission may or may not be a direct swap.

In short, it's *possible* but it's a complex project requiring significant mechanical knowledge, electrical skills, and potentially custom fabrication. It's far from a straightforward swap; think more along the lines of a major engine rebuild or even a custom build. It would likely be cheaper and less time-consuming to find a used 4.7L from a 2002 model year.