3.0 vs. 4.0 Wiring harness - Ranger-Forums - The Ultimate Ford Ranger Resource


2.9L & 3.0L V6 Tech General discussion of 2.9L and 3.0L V6 Ford Ranger engines.

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Old 01-21-2008
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Icon9 3.0 vs. 4.0 Wiring harness

Is it possible to just get a new ECU and use your old 3.0 wiring harness on a 4.0 engine. My brother is in the process of buying a new engine and was looking at a 4 liter, I'm a VW guy don't know much about fords.
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Old 01-21-2008
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yeah

Its a 1991 Ranger Automatic
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Old 01-21-2008
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It won't work. To do a 3.0 to 4.0 swap, the major pieces you would need are the engine, transmission, y-pipe, engine harness and PCM.
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cool thanks
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