68-70 Dodge A100 3speed manual speedo info needed

Discussion in 'Manual Transmission & Clutch Discussions' started by rustytoolss, Jul 31, 2018.

  1. rustytoolss

    rustytoolss Well-Known Member

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    A friend has a 68-70 dodge A100 van. it is a 318/ 3speed manual. He changed the center section from 3.55 to 2.94 a while back. Now his speedo is off (speedo gear needs to spin faster.)
    Here's the weird part. The speedo gear goes into the transmission on the passenger side of the transmission & it does not look like there is the aluminum adapter ???
    Anyone have any idea what trans he has ??? Also can you change the speedo gear in the transmission/ to correct the speedometer needle being wrong ???
     
  2. TheGrateRonzini

    TheGrateRonzini FABO Gold Member FABO Gold Member

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    A friend of mine has a 69 pickup. It was converted to 833 on the column with a pull lever reverse. Anyway, the truck came with 2 extra 3speed trans in the bed. I can take pictures tomorrow if that helps!
     
  3. rustytoolss

    rustytoolss Well-Known Member

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    If you could take some pictures, that would be great. Thank You :)
     
  4. TheGrateRonzini

    TheGrateRonzini FABO Gold Member FABO Gold Member

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    D20051D4-D9F5-4EF6-9BB9-7B430D9BE3FC.jpeg E6DD47B8-C363-4686-8ACA-5927B3825F21.jpeg 175062E8-58D3-4E6F-82BA-4EC2A104BB5A.jpeg
     
  5. Alaskan_TA

    Alaskan_TA Well-Known Member

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    It appears the speedometer cable was cut?

    Can you back that nut off to see what is underneath?
     
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    • rustytoolss

      rustytoolss Well-Known Member

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      Thanks for the pictures. I'm sure that they will help a lot.
       
    • TheGrateRonzini

      TheGrateRonzini FABO Gold Member FABO Gold Member

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      I’ll get over and get right in there soon. I haven’t made it over to him yet. I just asked for a few pix and this is what he sent. There are two, so I’ll be sure to document both and any differences I may find
       
    • AJ/FormS

      AJ/FormS 367 FormS clone 3.09-1.92-1.40-1.09-.78od 3.55s

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      That is the for-runner to the A230. I think it was called an A745, and comes with an unsynchronized first gear.

      The later models use a smaller diameter speed-o gear, and they are tuneable. Just pop it out and count the teeth, then adjust by using percentages A faster spin requirement requires fewer teeth. the difference is 2.94/3.55-.828. If you find a 30tooth speedo in there, then you would need 30 x .828= 24.8, rounds to 25teeth.
       
      Last edited: Aug 5, 2018
    • TheGrateRonzini

      TheGrateRonzini FABO Gold Member FABO Gold Member

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    • rustytoolss

      rustytoolss Well-Known Member

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      thanks for the pictures
       
    • Alaskan_TA

      Alaskan_TA Well-Known Member

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      3speed truck w.jpg