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3 speed OD. what's the final drive ratio?

Discussion in 'The Hokey Ass Message Board' started by davidh73750, Apr 23, 2012.

  1. davidh73750
    Joined: Apr 21, 2009
    Posts: 1,564

    davidh73750
    Member

    Okay the 700R is .70, 200R .65 does anyone know what the GM 3speeds with OD are?
    I have a 58 chevy with one. Not sure the working condition but curious before I do anything with it.
    I know these won't take a lot of abuse but it will be cruiser anyway.
     
  2. KenC
    Joined: Sep 14, 2006
    Posts: 541

    KenC
    Member

    Pretty sure those are 30 % OD or .666.
     
  3. 1934coupe
    Joined: Feb 22, 2007
    Posts: 4,321

    1934coupe
    Member

    Thats close enough for government work its somwhere above 30% and less than 36%
    Had a 67 Belair with factory OD

    Pat
     
  4. mtkawboy
    Joined: Feb 12, 2007
    Posts: 1,213

    mtkawboy
    Member

    I believe they are .75, I used to have one in my 57 Ford and Im pretty sure the GMs were the same
     

  5. davidh73750
    Joined: Apr 21, 2009
    Posts: 1,564

    davidh73750
    Member

    so the only electronics is the solenoid? Mine is all there with the T-handle.
     
  6. Dale Fairfax
    Joined: Jan 10, 2006
    Posts: 2,585

    Dale Fairfax
    Member Emeritus

    The "T" handle is not part of the normal operating system/procedure. It is a lock-out only. Out, it disables the O.D.; in, it enables. The ordinary operation or shifting is done by the solenoid which in turn has access to power only when the governor switch senses speed above a predetermined point.
     
  7. davidh73750
    Joined: Apr 21, 2009
    Posts: 1,564

    davidh73750
    Member

    what would be the best way to check out the solenoid? this car has been sitting since the 70's.
     
  8. J Twitero
    Joined: Apr 15, 2011
    Posts: 105

    J Twitero
    Member
    from Minnesota

    Might be easiest to bench test it. When I got the OD trans for my Ford I took the solenoid out of it and just applied 6v (yours should be 12v) to the case and the larger wire, I believe mine was blue, the other wire grounds the points so it will shift if it is wired stock. It should "thunk" in and out as power is applied/taken away. You may be able to jumper it with it in the car, but if the rest of the mechanism is positioned so it cant engage, you may not hear it move.
     

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