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C3 auto trans

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  • Andrew Strauss

    C3 auto trans

    I just did a test drive after rebuilding my trans in my 70 bb.The trans struggled to shift from 1-2 and never shifted to 3rd,I found the vaccum tubing for the shift modulator is splitt and therefore was only getting 7in lbs.How much vac is needed for proper shifting?
  • John H.
    Beyond Control Poster
    • December 1, 1997
    • 16513

    #2
    Re: C3 auto trans

    Full manifold vacuum - the trans senses engine load conditions based on the level of manifold vacuum fed to the modulator; if it's seeing less than actual full manifold vacuum, it's being "fooled" and won't shift properly.

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