Ok I guess I miss worded my post, I know not shifting into 4th is not the torque converter, as far as replacing the torque converter goes I am only doing that because I'm still getting a torque converter clutch stuck off code even after replacing the solenoid. As far as not shifting into 4th I don't really understand how replacing my old solenoids with completely brand new ones would make things worse. I mean stranger things have happened but in my experience it's extremely rare to find a part "bad" from the box.
Any ideas on how to troubleshoot why it's not shifting into 4th? That's more of what I was getting at. I tried to find a procedure list online but all I can find is everyone saying to replace the solenoids (already did, and had 4th with old solenoids, now have no 4th) normally I would go through the trouble of reinstalling the old ones for a baseline, but I already tossed the old ones and they are long gone.