I am trying to rebuild a 3 speed transmission for my old 85. I have two transmissions and the manual and was able to combine parts to make one except for Part 21 - pinion gear - manual says replace both bevel gears with set 56-671-C1. Both transmissions that I had - the pinion was bad - rust from water goes to the bottom and ruined one - other had a sheared tooth. I don't know who made these transmissions, but I do know they were used by multiple manufacturers. Does anyone have any ideas who made the transmission or on parts sources or...?