Hello, we have an 04 chevy Silverado 2500 6.0 4l80e and we are having transmission issues. The transmission shifts into neutral and park but no other gear works, it won’t go forwards or backwards. The shift interlock solenoid is broken but I don’t think that’s going to stop it from moving. The shift cable is moving good. The fluid also is good. The display works correctly. What else could I check?

 

Anyone?