Just got done converting my 46 knuck from a straight 3 speed to a 4 speed tranny. I used a cool cast bronze shift gate that has high gear forward so it shifts like my later ( 47 and up )bikes. Just flip the arm in the lid and used four speed drum and gears. Anybody know who manufactured these gates? They are very heavy castings and bolt right on the catseye tanks. I'm sure they came out right after 47 so you could convert your old bike to the new shift pattern.