I was thinking about going that route for round 2 after round one I went too short, but had I done that I still would have been too short. Granted I have +2 leafs and the pinion angle shims shoved the axle back a little too so it was bound to be different, but had not learned that yet. But I am using a V8 on conversion mounts on a slant 6 K frame so getting a factory shaft length for application may or may not have worked with or without my other variables… So glad I didn’t do that used factory spec shaft route, I would have wound up buying THREE times instead of TWO…
Which headache do YOU prefer, learning how to measure proper to get a proper length shaft on one try or randomly buy used shafts and hope you are lucky enough not to have a vibration… because if vibration… you have to measure proper anyway and then buy again…