GM B-Body Forum, 77-79 Caprice/Impala Forum

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GM B-Body Forum, 77-79 Caprice/Impala Forum

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GM B-Body Forum, 77-79 Caprice/Impala Forum

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GM B-Body Forum, 77-79 Caprice/Impala Forum

A forum for the owners and enthusiasts of General Motors B-Bodies from 1977-1990, but dedicated to the owners of 1977-1979 Impalas and Caprices. Join up now!


    speedo correction?

    terry cronk
    terry cronk
    Freshman Member (Tier 3)
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    Posts : 249
    Join date : 2015-08-19
    Age : 77
    Location : Mid-Michigan

    speedo correction? Empty speedo correction?

    Post  terry cronk Thu Jun 09, 2016 9:21 am

    I changed over my rear axle from 2.41 to 3.73. Now I have no accurate speed available.

    I purchased the larger speedo drive housing and the 2 inch housing plug. I have a couple of larger gears to be used.

    But what about the output shaft gear? With 28 tall tires and 3.73 gears, what's my choice?

    Any help here.
    terry cronk
    terry cronk
    Freshman Member (Tier 3)
    Freshman Member (Tier 3)
    5th Year Anniversary
    Celebrating 5 years of being our member!


    Posts : 249
    Join date : 2015-08-19
    Age : 77
    Location : Mid-Michigan

    speedo correction? Empty speedo correction

    Post  terry cronk Thu Jun 16, 2016 9:39 am

    This site has all the information on what combo of drive/driven gears for our 350/700R4/400 Transmission
    when we have gear changes.  This is for the 2 inch speedo housing on turbo 350 and the other transmissions.
    :-)

    http://www.73-87.com/7387garage/drivetrain/speedo.htm

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