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Where may I find a parts diagram and parts list for AA transmission?

What is the best way to remove the 2 main bearings? And where might I find all new bearings? Gaskets?

I have a model A doodle bug tractor. It has 1928 A engine. A 4 speed transmission with a pto on passenger side and an extra shift coming out the rear right and below drive shaft. 1. What is the extra shift? 2. The clutch adjustment is all the way tight. And when disconnected the clutch rod arm...

This is my first post. I have acquired an original model A or AA doodling tractor conversion. Engine # corresponds with July 1928. Radiator, cowl are 1928-29. Rear end axle is truck with 5 lug on 6 7/8" pattern bud wheels 8 .25 - 20 tires. Front wheels are wire with V8 hubcaps. 4 speed...

Hi all. I am a new to model As. Plans are to build a speedster. My engine runs but when turned off carb will have smoke come out intake and it dribbles a little gas. Any ideas