23 spline v 18 spline

It sounds like the shift linkage is out of adjustment, namely the 1-2 link is out of sync.Second guess is shifter needs to be taken apart and cleaned. In my last post on hear I was wrong on some of the information I gave about the 18 spline trans. The 67 and back 18 spline trans had the small 307 input bearing and bearing retainer(4.35 inches) and the 68 and newer have the 308 bearing and 4.80 bearing retainer, sorry but the memory is the first thing to go, I am just to frigging old.