727: Park or low gear (1st) madness!

The lever is round on 2 ends and flat on 2 sides where it slides over the shaft. All the bolt does is hold it on. Try unhooking the cable on the shift shaft and put the trans in first and the shifter in first, check the alignment and adjust the cable accordingly to there, see if that helps. It should slip on with no rearward pressure. If you have to somewhat force it on then adjust the cable some more.