The AA 4 speed shift tower is actually fairly easy to rebuild. Normally the little quarter inch diameter pins wear out and that’s what creates the slop in the shift handle. The later transmission pins are available from the vendors. I made my own. Here’s a video that I made rebuilding the AA 4 Speed shifter. https://m.youtube.com/playlist?list=PLav-W1BC-Nj_93ZthEPE4m50cDoDpBOJh