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what is required to swap a ford 2.9l engine over to a ford 4.0l engine?
i have a 1989 ford bronco 2 with a 2.9l engine and I'm wanting to change it over to a 4.0l engine an i need to know what is required to swap them around. Do i need a 4.0 wiring harness or can i use the 2.9 harness?