I have a 1993 FLHS and the splines on the shift shaft lever are wearing out. The shift rod lever is sloppy on the shaft. I had the shift linkage replaced last year and the mechanic had to remove the primary drive to install the shift rod lever. Can I replace the shaft in the tranny without removing the primary drive? Can I do this easily through the top after removing the cover? Will I need any special tools or will I need to make any adjustments to the shift linkage? This is a 5 speed.