Hard shifting all gears engine revs up then goes into next gear, code P0715

Thanks for taking the time to read this:

i have the truck listed above iforce engine. My transmission is a 30-40le. The internet does not even list my transmission as the 30-40le, they classify it to being a 304e. But the tag from the manufacture has stamped right on the tag 30-40le. Anyways either one, is the one I have. I dropped my transmission pan, replaced solenoids, three all together. Cleaned pan, wiped down where gasket goes etc. Bought a valve body separator gasket set both upper and lower valve body gaskets were replaced, and separator plate wiped and cleaned also. Put all back together, I am assuming correct, took pictures of where the balls were located, 9 total, 2 big and 7 smaller ones. Took pictures of everything so it goes back the same. Installed everything into place, cranked truck, test drove, now hard shifting all gears engine revs up then goes into next gear. Clearly, something went wrong, or just so happened, something broke while working on it. The original problem which started all of this was that I had no overdrive gear. All gears were fine, even tried pressing button on column several times, but to no avail. I had no overdrive. I drove truck like this for a year or so, tired of not having overdrive, I decided to order the separator gasket set, because last time I was in the transmission. I noticed it was very dry rotted, so I thought that was my overdrive fix. Now not only do I still not have overdrive, but now shifting very hard, violent, etc, worse than before. There is a trouble code that reads p0715 which already researched and found that it is a turbine speed sensor problem. Got under truck removed sensor, tested wire harness, all okay, tested sensor, ohms read fine. What is wrong with my truck?