Here's why:
* Engine Management Systems: The 1995 Geo Tracker likely has a more sophisticated electronic fuel injection (EFI) system compared to the likely carburetor or simpler EFI system of the 1986 Samurai. The wiring harnesses, sensors, and computer modules are significantly different and incompatible.
* Transmission Compatibility: While the transmissions might *seem* similar, there could be differences in bellhousing bolt patterns, input shaft lengths, and other critical dimensions preventing a direct connection to the 1986 engine.
* Exhaust System: The exhaust manifolds and piping will almost certainly not match up.
* Mounting Points: The engine mounts themselves might not align, requiring fabrication of new mounts.
* Wiring Harness: As mentioned above, extensive rewiring would be necessary to accommodate the different engine management systems.
* Emissions Compliance: Swapping in an older engine might violate emissions regulations in your area.
In short, while some parts *might* be interchangeable, the project would require a significant amount of mechanical expertise, fabrication skills, and potentially custom parts. It's far more likely to be a very complex and expensive undertaking than a simple engine swap. Consider the cost of the modification versus the cost of finding a suitable replacement engine for the Geo Tracker. A used 1.6L engine for a Geo Tracker would be a far more straightforward and cost-effective solution.
