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    1989 GM Light truck th400 won't shift after rebuild

    Hello all, I just rebuilt my first auto trans. TH400 out of a '89 light truck. I am 64/yrs old I am not a driveway mechanic, have been in the auto industry for over 35 years and have built or restored plenty of cars but never an Auto trans. I had no history on the trans, bought a kit that...