I have the input gear shaft and the splined coupler and the adapter to bolt a NP205 from a 4spd gm to a th350 automatic. i bought all 3 parts new from a gm dealership when i removed the 4spd stanard from my truck and converted my late 70's np205 to fit right onto the th350 i cant remember if the driveshafts stayed the same but i seem to think they did. email me if you are interested these 3 parts are pristeen and have very few miles on them rstankevitz@hotmail.com  

I am trying to find the parts that you have. I am removing a NP203 and replacing it with a NP205 from a 4-speed. I need the input, coupler and adapter to fit to a TH350, but I will also need the shifter and drive shafts.