Necro up!
What parts of Wire Harness need change?
I have stock 5.0 engine, all Wire Harness, T5 trany, exhaust and strange automatic ECU without any O2-sensors from factory.
All this I will put to my 94 3,8 AODe.
I'm sure that change all wire don't need.
You will need all the engine harnesses and the computer harness. The trans harness will swap over but you'll have 2 extra O2 sensor plugs in the rear that won't be used. you can simply tie them out of the way.