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Will a 4.6 from 1998 Crown Vic be replacement motor for 1999 F150?

No, a 1998 Crown Victoria 4.6L engine will not be a direct replacement for a 1999 F-150's engine without significant modifications, and likely won't be worth the effort. While both are 4.6L modular V8s, there are key differences:

* Mounting: The engine mounts are different. The F-150 has a different frame and mounting points compared to the Crown Victoria.

* Accessories: The placement and type of accessories (alternator, power steering pump, etc.) will likely be different, requiring extensive rewiring and potentially custom fabrication.

* Exhaust: The exhaust system will need to be completely replaced.

* Computer/ECU: The engine control unit (ECU) is incompatible. The F-150 ECU is programmed for the truck's specific needs and sensors, which differ from those in the Crown Vic.

* Transmission: While both might use an automatic transmission, the specific transmission and bellhousing are likely different, requiring modifications or a complete transmission swap.

While it *might* be *possible* to make it work with significant fabrication, welding, custom parts, and extensive wiring, it's simply not practical or cost-effective. The time, money, and expertise required would far exceed the cost of finding a used 4.6L engine specifically designed for the 1999 F-150, or even a remanufactured one.

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