Please help ID my rear ratio

Discussion in 'Got gears?' started by robert v, Aug 19, 2020.

  1. robert v

    robert v Well-Known Member

    Hello,
    Just picked up 1964 Olds F85 rear end for my 4 speed skylark.
    I am in process of clean up and will install new seals and bearings, bushings and maybe power trax quiet slip.
    I counted 37 teeth on gear, didn't count smaller gear.
    See attached photo.
    Can a forum member help me determine my rear ratio from this photo.
    I am looking to find small bushings for upper ears on this 1964 rear.
    Thanks,
    Robert
     

    Attached Files:

  2. Brad Conley

    Brad Conley Super Moderator Staff Member

    37/12=3.08
     
  3. robert v

    robert v Well-Known Member

    Thanks,
    seems very straight forward, did factory ever mismatch pinion gear with main gear?
    I mean could they have installed an 11 tooth pinion gear if the main gear was marked 12-37.

    I can't located any number on the tubes.

    Original owner was pretty certain that this rear was 3:36 not 3:08.
    I guess I will count teeth on Pinion gear today.

    Any additional info from forum members is appreciated
     
  4. Brad Conley

    Brad Conley Super Moderator Staff Member

    you could also count wheel revolutions and get the ratio, but that's pretty much it stamped on the ring gear.
     
  5. robert v

    robert v Well-Known Member

    I removed cover and this time I was able to read the pinion gear stamp
    12 teeth.
    3:08 gear ratio confirmed.
    Looking to purchase upper ear bushings for 1964 8.2 10 bolt BOP rear.
    Thanks
     
  6. flynbuick

    flynbuick Guest

    12 teeth on the pinion gear is what you have with a 3 .08 gear set when the ring gear has 37 teeth. How many teeth does your ring gear have?
     
  7. robert v

    robert v Well-Known Member

    yes, exactly 37, and 12
     

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