I just replaced the torque converter and c3s. On the 2-1 downshift I am getting a really hard shift. Anything over 85mph and I am in limp mode.

Its throwing p0746 p0840 and p0845.

Anyone have any suggestions where to start this time?

Did you reset TAPS?

TAPs don't set codes. I would start with the valvebody. You might have a sticking valve.