1985 and up had the LONG shaft...There are 7 different versions of the TH400 shaft. So when you say "short one" you actually could be referring to the shortest one they made to fit a NP203 and not a 205...
I don't know if mine will work, I swapped it out of a 2wd with a fixed yoke. I had to put the short one in it so I have this one laying around. I can measure it if you want when I get home tonight.