Transmission slipping and code P0963?

Hi William, thank you for your response, so yes, the valve body assembly was the first thing we changed and were sure that would solve the problem but unfortunately it did not, this has been so hard at guessing, finally decided to open the transmission and that is where I am at now but was not sure how all the disks and friction disks should look, thank you.

Hello, I changed the disks in the transmissions hoping this would fix the slipping praying it works but I am having trouble getting one of the parts back on I believe it is called the steering wheel knuckle, I can't get them to snap back together, any suggestions, I will upload a few pictures to see if you can see what I mean, my hand may be in the way. Thank you

Thank you for your response, I am very sorry, my wife helped me type up that last message, the transmission is in place not removed, I changed the disks only, I was able to get everything put back together, and the problem continues, I accelerate, and the first few seconds is good but then it starts in slipping and then a few minutes later it respondes less and less when I push the gas, I am really confused at this point, after having changed the disks and having the car battery disconnected for days do I need to do anything specific to the car before the slippage goes away, please any advice, this problem is not going away and it seems I have tried everything, one of the other mechanics mentioned the transaxle, could this be the issue, is there any way to test the transaxle to see if it does work before I go and buy a new or used one, thank you so much for your response and patience, one more thing I wanted to ask, is there any way I can call you or you can call me to better explain, thank you.

Thank you for your response, I am very sorry, my wife helped me type up that last message, the transmission is in place not removed, I changed the disks only, I was able to get everything put back together, and the problem continues, I accelerate, and the first few seconds is good but then it starts in slipping and then a few minutes later it respondes less and less when I push the gas, I am really confused at this point, after having changed the disks and having the car battery disconnected for days do I need to do anything specific to the car before the slippage goes away, please any advice, this problem is not going away and it seems I have tried everything, one of the other mechanics mentioned the transaxle, could this be the issue, is there any way to test the transaxle to see if it does work before I go and buy a new or used one, thank you so much for your response and patience

Hello, I am in need of assistance with this car, it is very confusing, about a month ago it started to slip when trying to go into 3rd or 4th Gear and the RPMS are the only thing that go sky high, but the car does not go faster than around 35 mph, after everything I have done I just took it for a ride and now it only allows 1st gear to work but when it is time to go to 2nd or anything else it slips and RPMS go sky high, below I will list everything I have done so far, thank you so much for your time.
Changed Solenoids and housing module
Flushed put all new transmission fluid, the old fluid was very dark and looked like there were little pieces of metal or aluminum.
The last thing I just did was change the Friction/Clutch plates.
As far as having to do anything after changing those or having the battery disconnected for days, I have done nothing, such as relearn or reprogram, could this be why it still slips, please help I am really confused at this point, thank you.