Need help from a speedometer gear size expert!

cruiser said

Thanks, Mike. I've never removed one before. How hard is this to do? Will tranny oil go all over the place? Are the drive gears readily available?

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They are easy to get. Brewer Performance has them. Megaparts USA does as well to name a couple. Easy to pull and it will make a little mess. Put a small drain pan or a old cookie sheet underneath. There should be a bunch of threads here to show you how.