Glenn.........earliest 9N's rear axle were "smooth" and WEAK, Ford soon improved the axle attachment to a stronger riveted design. Unless yer a certified sphincterly challenged originality inspector, don't worry about it. Yes, the smooth axles are semi-more valuable to originality tractor queens.
As fer yer lift, at ALL times, yer PTO must be turning. Quickest test of hydraulic lift is to remove the 6-in roundy dipstick plate and look fer "squirts" while trying to lift sumptin'. Report back and start a new message. .......HTH, Dell