To have a 4WD system, you would essentially need to source a complete 4WD drivetrain from a donor 1999 F-150 4x4 truck (including the transfer case, front axle, driveshafts, differential, control arms, etc.) and then perform a nearly complete swap. This involves:
* Finding a suitable donor vehicle: This is crucial. You need a truck of the same year and model as your RWD F-150, but with a 4x4 drivetrain. The parts must be compatible.
* Disassembling the donor vehicle: Carefully remove all the necessary 4WD components.
* Modifying your RWD truck: This may include welding new mounts, modifying the frame, and potentially altering the suspension. This is complex work and requires welding skills.
* Installing the new components: This is a major undertaking requiring extensive mechanical knowledge and experience.
* Wiring and controls: You'll need to integrate the 4WD system's electrical components and controls into your existing wiring harness.
* Alignment and testing: Once everything is installed, a professional alignment is crucial, and thorough testing of the entire 4WD system is necessary.
The cost of this conversion will likely exceed the value of the truck. It's far more economical and practical to simply buy a used 1999 F-150 4x4. The time, effort, and specialized tools required make a conversion extremely impractical for most people. Even experienced mechanics often avoid this type of project due to its complexity.
