do you need sliding gears? Theold craftsman we use for picking up leaves has a transaxle that uses spur gears on a 3/4 shaft.
craftsman rear engine model # 536.270111 5 speed . still have a parts manual might find an online diagram
I used to use left over hunks of Diamond std. #35 chain on my stock 4-strokes, got it at work because they always threw left overs from full boxes in the scrap bin, it is usually only good for 1-2 races, not space chain and if used with much power the plates will weld themselves together just before they break, buy the good stuff, all I needed to see was a guy that had a scar on his elbow about 12" long, I now use only "Regina" chain.