i have a manual shift np271-f ford 31 spline input. most of them are gonna have a 31 spine input as far as i know. i believe there is a company transfer case express that can make you a 29 spline input for that case. i could be wrong on that. but as far as i know
im on the right track.
dont know much about the 273 but you might look into it.
the only 271s i know of were 24, and 31 spline inputs.
if you are intersted pm me an offer. i am going to put it on ebay soon, but like i have said before, i would much rather sell it to a fellow compd'er.