* Different Engine Management Systems: The 1989 model likely uses a simpler, carburetor-based system (or a very early fuel-injected system) while the 1996 Cherokee almost certainly has a much more sophisticated, computer-controlled fuel injection system. These systems are not compatible. You'd need a complete wiring harness, computer (PCM), and potentially sensors from the 1996 model to make it work, which is a massive undertaking.
* Transmission Differences: The transmissions used in these years are likely different, requiring further adaptation or a complete transmission swap.
* Mounting Points: While the engine bay might seem similar, there could be subtle differences in mounting points and accessory placement that would require fabrication and custom work.
* Exhaust System: The exhaust systems are almost certainly incompatible.
* Cost and Complexity: The amount of work required—rewiring, fabrication, custom parts, and potential issues with unforeseen compatibility problems—would likely outweigh the cost of a suitable replacement engine for the 1996 Cherokee. Finding all the necessary parts for a conversion like this would be very challenging.
In short, while some engine swaps are feasible, this one is impractical due to the significant differences in technology and design between the 1989 and 1996 models. It would be far simpler and more cost-effective to find a suitable replacement engine of the correct year for the 1996 Cherokee.
