[911pcars]

I suggest doing the easy stuff first (Homer Simpson says his two most favorite letters of the alphabet are E and Z). Wise man.

Remove the sheet metal cover from the rear floor and take a look at the shift coupler. Verify the gearbox shift shaft (into the gearbox) moves along with the shift lever. Any loss of movement means there is wear in the linkage joints (bushings). Enough wear can prevent the shift shaft from moving far enough to select certain gears.

Like the others, I suspect a worn shift lever bushing and possibly the front support bushing for the shift shaft.

The adjustment set screw on the front of the shift housing doesn't affect the left-right range of movement. However, it does affect the amount of preload on the lever movement and thus how freely it moves.

Sherwood