The ring gear changed from the A to 4A Roadsters. The difference is the number of teeth on the ring gear as well as the on the starter gear. Keep this in mind and only use A series ring gear with A series starters.
That being said, I was in the enviable position of having TWO flywheel/ring gear. One nice flywheel had an awful ring gear. The other had a questionable flywheel and a nice ring gear. What to do... what to do... Got it! I will swap them over!
The ring gear are shrunk on the flywheel. That is that it held in place simply by the inside of the ring gear being smaller in diameter than the outside of the flywheel. How does this happen? Well to install the gear, it must be heated which allows the metal to expand and the inside diameter increases. To help matters along for installation, the flywheel can be cooled which causes the metal to shrink. Place the expanded (and hot) gear on the shrunk (and cold) flywheel and let nature/physics take their course.
The end result is a ring gear that is held tightly in place and can be replaced should it become worn.
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