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I have a 1990 chevy 2wd pu with a worn out 4.3, I can buy a lower mileage 4.3 out of a wrecked 1998 truck, both trucks are 2wd, the 1990 is a manual versus the 98 auto. Will the wiring harness hook up the same on mine, if not what can be done to make it work without any electrical reliability problems?