Well my #2 Massey's arrived this weekend and after looking at the transmission there is a slight difference. the big gear for the differential has one gear on the more complete one and the other has two gears. When we were in Kansas looking at another pair of these #2's we started to discuss the gears and how the second gear did not mesh with another gear.

So the question is why is the gear on there and why did they change to add it? I know the newer parrett H used a 3 speed transmission so maybe these gears are made for that model? And which style would be older?