* No Original 304s in TJs: The TJ Wrangler, produced from 1997 to 2006, never came with a 304 cubic inch engine. They were equipped with either the 4.0L inline-six or the 2.5L four-cylinder.
* Different Mounting Points: The 304 engine was used in older Jeep models (CJ and YJ) and has different mounting points and dimensions compared to the engine bay of a TJ.
* Engine Management System: The 304 engine would be incompatible with the electronic control systems of a 1998 TJ. You'd need to completely rewire and retrofit the vehicle's electrical system to handle the older engine.
* Transmission Compatibility: The 304 engine used different transmissions than the TJs. You would need to find a compatible transmission, which could be a major undertaking.
Possible Alternatives
If you want more power in your TJ, consider these options:
* Engine Swap with a Compatible Engine: You could swap in a newer 4.0L from a later Wrangler or a 4.0L from a different Jeep model.
* Engine Upgrade: There are performance upgrades available for the existing 4.0L engine, such as headers, exhaust, and engine management systems.
Important Note: Swapping engines can be a complex process and requires significant knowledge and resources. Consider working with a qualified mechanic who has experience with Jeep engine swaps. Make sure to check local regulations as well, as some areas might have restrictions on engine modifications.
