"lack of downshifting after coming to a stop". Does that mean that it's stuck in a higher gear and that you have to downshift manually to get it to take off in first? Sounds like a governor problem.
You are correct. I have personally removed and inspected the governor in the tailshaft. The trans builder also said it all looked great. I've always had an issue with it not wanting to down shift to 1st after a stop. It works fine when manually shifted. I assumed that I messed something up on the transgo install, but it's still acting up with the new TCI valvebody.
