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I have a 1995 f350 powerstoke that has a electrical issue causing the torque converter not to engage and the computer senses no lock up and throws a 1728 trans slip code. I had this problem for the last year. A brand new trans from ford was installed last week and still not lock up with same code appearing. I swapped engine and compueter and still have same problem. The harnest is fine going to trans, also checked brake lights and replaced speed sensor. I know it's in the electrical but where do I start? And how to diagnose
