Factors that determine feasibility:
* Engine Type: Are both engines V6 or V8? A V6 swap with a V6 is generally much easier than a V8 swap with a V8, and swapping between V6 and V8 requires significantly more work.
* Specific Engine Codes: The exact engine code (e.g., 4.6L 2V vs. 4.6L 3V for V8s) dictates the compatibility of many components. Even within the same displacement, differences in accessories, computer systems, and wiring harnesses can create challenges.
* Transmission: Will the transmission remain the same? If the transmissions are different, that adds considerable complexity.
* Wiring Harness and Computer: The engine's computer (PCM) and wiring harness are usually specific to the year and engine. You might need to swap the entire harness or perform extensive rewiring.
* Mounts and Accessories: Engine mounts and accessory placement might vary slightly between years, potentially requiring modifications.
Challenges:
* Wiring: This is often the most significant hurdle. Even if the engines are similar, the wiring harnesses are often different enough to require extensive modification or replacement.
* Computer Compatibility: The 1998 PCM may not be compatible with the 1996 vehicle's sensors and other systems without modification or a custom tune.
* Exhaust System: The exhaust system may need modification to fit the new engine.
In short: While it's *technically possible* to swap a 1996 Mustang engine with a 1998 Mustang engine, it's not a simple bolt-in affair. The more similar the engines are (same type, displacement, and similar supporting components), the easier the swap will be. It often requires significant mechanical and electrical knowledge, specialized tools, and potentially a custom tune. For someone with limited experience, it's a challenging project that could quickly become very expensive. Consider the cost of parts, labor (if you're not doing it yourself), and potential unforeseen problems before starting.
