Shift solenoid D

I apologize I don't understand this car at this point. I changed the transmission shift control box on the front of the transmission. When tested the speedometer went crazy and still no shift. The next day ran code reader again and got codes for the input and output speed sensors along with code PO750. Took out and cleaned speed sensors and placed them back in position, cleared codes hoping that fixed the shift issue as well. However it didn't and only show code PO750, at this point. Again I ask please help.

Yes sir I understand.I hit the deer around/or about July 14th. I continued to drive my car until the insurance came through around/or about August 6th. At this point the car is still running ok, however the transmission was shifting ok beside an occasional hard down shift when coming to a stop ( the transmission had did that for a couple of years, before the deer). My car would go into limp mode and all I had to do was pull over and restart the car. So when I put the car in my father's shop the transmission was shifting until I changed the transmission oil and filter. Now it will take P R N D just doesn't change out and the rpms just rise. The car has plenty of power until it goes back into limp mode. So again I changed the transmission oil and filter. However still no difference.

Yes sir I used the correct fluid, yes sir I placed the filter back correct both times, no sir the fluid wasn't burnt, yes sir this is one of the parts that I replaced. Now I need to tell you that my father found a connector that I had over looked twice apparently, so he hooked up the connector and problem solved. No codes and transmission shifting and changing out great. Thank you guys for all of your help and all that you do. I apologize for wasting your time for a overlooked connector.