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Thread: 1957 Transmission swap

  1. #1

    Default 1957 Transmission swap

    I am considering a swap from a M-20 to a powerglide or TH 350
    My 57 has a 67 Chevelle 283 with a Muncie 4 speed.
    Will the flywheel have to be changed?
    Anyone have a PG or TH they might like to swap?

  2. #2
    Join Date
    Dec 2011
    Location
    New Haven, Ct
    Posts
    981

    Default

    HI there,

    #1, yes, I would always replace the flywheel anyway due to age.

    #2, remember you may have to shorten the propeller shaft in between the tailshaft of the transmission and the yoke of the differential.

    I will have to dig in my archives tomorrow AM to confirm my suspicions.

    And make sure that the transmission cooler is more than adequate as the TH350 does generate a little more heat.

    Allthebest, Paul
    GM World Class Certified Service Technician.
    Like us on Facebook: www.facebook.com/corvettemechanic
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  3. #3
    Join Date
    Dec 2011
    Location
    New Haven, Ct
    Posts
    981

    Default

    HI there,

    After some major digging, a few things I found out.

    #1, yes, obtain a flexplate and they are readily available.

    #2, the research on the driveshaft/propeller shaft shows me that it is all the same from transmission to the differential. P/N was 3712381 from 55-62 with no breakdown or specific changes between the manual transmission and automatic transmission.

    Allthebest, Paul
    GM World Class Certified Service Technician.
    Like us on Facebook: www.facebook.com/corvettemechanic
    Twitter: www.twitter.com/GMvettemechanic

  4. #4

    Default

    Thank you Paul,
    I appreciate your research.
    When I pursue the swap I'll let you know if I find a PG or a TH
    Bob

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