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I have noticed a lot of posts on 5.2-5.9 engine swaps. They talk about engine mounts and trans mounts,but what about the electrical? Do I have to swap the harness? Do I need to change the ECM or can I have it flashed by a dealer? I'm not looking to install anything sick just not exactly stock.
 

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I don't think as far as wires there different or computer they both use obd 2
 

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OBD II started with '96 model year. Connectors for OBD I are different, as well as internal controls on transmissions, so you can't just swap out connectors. OBD I computers are not flashable. You don't need to flash an OBD II just for a comparable swap. Much depends on what year and what you're planning.
 
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