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Technical Chrysler 331 transmission adapter

Discussion in 'Traditional Hot Rods' started by John Deuel, May 15, 2024.

  1. John Deuel
    Joined: Nov 20, 2014
    Posts: 171

    John Deuel

    I have an early Chrysler 331 hemi with the extended bell housing. Currently there is a Les side shift transmission bolted up. Would anyone know if that same adapter plate would also take later GM transmissions like a Saginaw or Muncie. Thanks.
     
  2. John Deuel
    Joined: Nov 20, 2014
    Posts: 171

    John Deuel

    Should read LaSalle side shift transmission
     
  3. ROADSTER1927
    Joined: Feb 14, 2009
    Posts: 3,166

    ROADSTER1927
    Member

    Different bolt pattern.
     
  4. Andy
    Joined: Nov 17, 2002
    Posts: 5,161

    Andy
    Member

    I made an adapter plate to mount a LaSalle trans to a SBC bellhousing. I would think you could make a plate for the adapter you have or redrill it.
     
  5. 73RR
    Joined: Jan 29, 2007
    Posts: 7,254

    73RR
    Member

    Modifying the existing adapter is all dependent on the input shaft length and location of the splines as they relate to the position of the disc.
    Also, keep in mind that the trans must retain alignment with the crankshaft. MaMopar says 0.007 TIR, gm may be different but it can't be off by degrees of 'sundial'....
     
    Andy likes this.
  6. Andy
    Joined: Nov 17, 2002
    Posts: 5,161

    Andy
    Member

    True!
    I did a lot of measuring and machining.
    The LaSalle was weird as the input collar did not bolt to the transmission. It just was held in by the bell housing.
     
  7. HEATHEN
    Joined: Nov 22, 2005
    Posts: 8,643

    HEATHEN
    Member
    from SIDNEY, NY

    I've seen adapter plates to bolt a Cad/LaSalle transmission to a Chevrolet bell housing, which means to me that the input shaft of the Cad/LaSalle is longer than a Chevy; therefore, I don't think that you can go in the opposite direction. The Chevrolet input shaft would end up being too short to do it.
     
  8. KenC
    Joined: Sep 14, 2006
    Posts: 1,056

    KenC
    Member

    Maybe use a special/longer/stepped/etc homemade pilot bushing. If careful measurements, really careful, show that it will extend far enough and not interfere with the clutch setup.
     
  9. continentaljohn
    Joined: Jul 24, 2002
    Posts: 5,602

    continentaljohn
    Member

    Trans adapters are interesting for the 331 extended bell so much I think they are cool. They range from a flat plate to an inverted bell going into the hemi bell housing. As said it’s all about the imput shaft length . A few examples the deeper one is for an early ford transmission that Fit Into the bell of the hemi the other you see is a vintage speed gems with a 1.5 rise .
    I know the caddie transmission has a long shaft so what the difference in length between the Chevy transmission and the Cad lasalle IMG_7118.jpeg IMG_7119.jpeg IMG_7120.jpeg IMG_7121.jpeg IMG_7122.jpeg IMG_7123.jpeg
     

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