However, it's important to clarify:
* Mechanical Limits: The engine itself has mechanical limits. The components (valves, connecting rods, etc.) will eventually fail if revved excessively beyond their design limits. This is a physical limitation, not an electronic one.
* Transmission Interaction: The transmission itself might have some inherent protection (like a rev limiter built into the transmission's internal components) against extremely high RPMs. This, however, is not a direct feature of the 4.0L V6 engine itself.
In short, rely on your own good judgement and avoid over-revving the engine. The absence of an electronic over-rev protection system means that the consequences of exceeding the engine's safe RPM range are more severe.