What is the correct speedo tooth gear for... - NCRS Discussion Boards

What is the correct speedo tooth gear for...

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  • yello58

    What is the correct speedo tooth gear for...

    3.36 gears and 3.55 gears in a 1958 Corvettes; Automatic. Thanks!
  • Joe L.
    Beyond Control Poster
    • February 1, 1988
    • 43193

    #2
    Re: What is the correct speedo tooth gear for...

    "yello58"------

    With 3.55 rear gear and powerglide, the correct gear is a 21 tooth gear of GM #3708142. For 3.36 ratio and powerglide the correct gear is a 20 tooth gear of GM #3708246. Unfortunately, both are long-since GM-discontinued. A speedometer shop might be able to fix you up with a replacement, though.
    In Appreciation of John Hinckley

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