Can you put a 2004 Toyota 4-cylinder engine in a 1994 Toyota truck?

Yes, you can swap a 2004 Toyota 4-cylinder engine into a 1994 Toyota truck, but it may require modifications. The mounting points, wiring harness, and transmission compatibility could differ between the two models, so you'll need to address these issues. Additionally, ensure that the engine's emissions and other regulations comply with local laws. It's advisable to consult with a professional mechanic or a specialist in engine swaps for a smoother process.