So I took a look at the shifter, shifter rod and shifter arm that attaches to the engine. The shifter arm hole measures .279. The shifter rod measures .272. The hole in the shifter arm that attches to the engine measures .297, that is .025 thousands bigger. That is the source of the majority of the slop in the shifter and will only get worse over time. I am going to see if I can find a bushing at the hardware store to fix this and give it the same .007 clearance the shifter rod has where it goes thru the shifter. The slop in the shifter is 3/8" just because of this clearance. Hopefully a new bushing will cut that in half. Unfortunately I am going to have to make one.