Re: 16/27 cluster
The 81A-7017 and 8M-7017 are interchangeable 16 tooth drive gears. They have a gear diameter of approximately 2.35”. They work with the 68-7113 and 8M-7113 cluster gears (28-24-18-14 teeth) and are used from 1939-48 cars and 1939-50 pickup truck 3 speed transmissions. They also honor that good old 44 rule.
The 1C-7017 is the 16 tooth drive gear that is used in the 1951-52 pickup truck 3 speed transmission. The diameter of the gear is 2.45”. This is the gear that is matched to the 1A-7113 cluster gear (27-23-17-13 teeth). The .010” difference in diameter is very difficult to “see” with the naked eye but it easily measured with a caliper.
Don’t attempt to mix the use of these three gears. The earlier ones would have a sloppy fit in the mesh with the later cluster gear. The later gear would create a VERY tight gearset that you would have to force together.
And there you have..... the rest of the story.
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