Thanks guys! I thought I was going crazy for a bit! I know the 727 in all fullsize Jeeps ('80 to pre '84 Cherokee and wagoneer, and '84 to '91 Grand Wagoneer plus '80 up J trucks) has 23 spline like the '80 IH pickup I had. Some Jeep list guys told me the IH only had Dana 20s! Also, with the output shaft from a SJ Jeep 727, you can run NP series transfercases from the '80 up fullsize SJs and '84 to '86 XJ and MJ Jeeps (they usually use 904 trannies though the transfercase from the 4 and V6 is 23 spline till the 4.0L came out. They were 21 spline '87 to late '90 and 23 spline again after 09/90), but they are lefthand drop front driveshaft.
Hope my info helps someone else!