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  • GEAR RATIO

    hi i have a 1986 thompson it has twin 170 with alpha drives it doesn't have the stickers on the drives so i need to know what ratio i have so i may order a new drive . thanks

  • #2
    The 170's would use a 1.81 ratio.

    Thanks,

    Tech Support
    Brunswick Corporation is the original equipment manufacturer (OEM). Sterndrive Engineering, Inc. (or SEI) is not affiliated with the Brunswick Corporation and is not authorized to sell or service Brunswick products.

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