I have a 2002 chevy Silverado,running a 6.0L with the 5.3 flywheel to a 4L60e its been acting up with the transmission, i lost all gear’s except first, neutral, and reverse, it will not shift. Thought it was the transmission so i swapped with another that was in a working truck, now i still have the same problems, the speedometer also stopped working, and it worked before i did the transmission job. I’ve changed the vss, and checked the harness i have no idea what to check now! Any tips would be appreciated!