Flexplate Bolt Sizes

Discussion in 'Transmission and Drivetrain Tech' started by cosworth, Apr 29, 2012.

Discuss Flexplate Bolt Sizes in the Transmission and Drivetrain Tech area at forabodiesonly.com.

  1. cosworth

    cosworth Well-Known Member

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    I have a 74 Duster with a 318 that was originally a automatic car, that i am putting a 3 speed manual in. I purchased pressure plate bolts that are wayyyy to small, then thinking about it I dug out my old flexplate bolts that are the right size but too short.....

    Does anyone know what size this is and where i can find them?

    May just need to run down to the hardware store these bolts are only grade 8
     
  2. cosworth

    cosworth Well-Known Member

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    I think ive figured it out posting here for somebody to correct me if im wrong.

    7/16-20RH with approx .910 Underhead bolt lenght.

    Flexplate bolts are 7/16-20 with .50 underhead
    Pressureplate are 3/8 with approx .910 underhead
     
  3. oldkimmer

    oldkimmer Well-Known Member

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    ..........sounds about right...............kim............
     
  4. cosworth

    cosworth Well-Known Member

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    I guess they used different cranks for auto/manual cars?