Ring and Pinion Question

Discussion in 'Technical' started by Resto, Sep 17, 2011.

  1. Resto

    Resto Benders Evil Twin

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    How can I find out what the gear ratio is in my rear end? There is no tag on it. The car is a 73 2door had a 250 I6 with a C4.
     
    Resto, Sep 17, 2011
    #1
  2. Jsarnold

    Jsarnold Senior Member

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    If you don't have the door sticker, raise just one rear wheel off the ground with the transmission in neutral. Have someone turn the raised wheel exactly one turn while you count the revolutions of the drive shaft. Divide the drive shaft turns by 2.
     
    Last edited: Sep 18, 2011
    Jsarnold, Sep 17, 2011
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  3. don graham

    don graham MCG State Rep

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    don graham, Sep 17, 2011
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  4. Resto

    Resto Benders Evil Twin

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    I guess Im doing Home Work tommorro. Thanks Don:)
     
    Resto, Sep 17, 2011
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  5. 71gold

    71gold Frank Cooper Supporting Member

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    door stickers... don't mean squat on a 38 year old car...:rofl2:

    "raise just one rear wheel off the ground with the transmission in park. Have someone turn the raised wheel exactly one turn while you count the revolutions of the drive shaft. Divide the drive shaft turns by 2."
     
    71gold, Sep 18, 2011
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  6. rthomas771

    rthomas771 Member

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    Quote from The repair manual:

    PROCEDURE FOR DETERMINING REAR AXLE RATIO
    1. Jack up the rear of the car enough to clear the rear wheels and place on jack stands.
    2. Place a horizontal chalk mark on the driveshaft and a vertical chalk mark on the inside of the tire.
    3. Slowly turn the driveshaft and count the revolutions it takes to turn the tire once. As an example if it takes 3-1/2 revolutions of the driveshaft to turn the wheel once, then the axle ratio is 3-1/2 to one or 3.50 : 1.

    If I was a betting man...I'd bet the driveshaft turns 2-3/4 turns or no more that 3 turns which is a 2.79 or 3.00 gear
     
    rthomas771, Sep 18, 2011
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  7. Resto

    Resto Benders Evil Twin

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    Its a 279 Thanks Don.
     
    Resto, Sep 18, 2011
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  8. tomboy

    tomboy Member

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    will the drive shaft turn if the trans is in park?
     
    tomboy, Sep 18, 2011
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  9. Jsarnold

    Jsarnold Senior Member

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    No. :badwords: Thanks for the correction. Post is edited to say "Neutral".
     
    Jsarnold, Sep 18, 2011
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  10. Resto

    Resto Benders Evil Twin

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    The sticker is original and the car is in original condition, only 2 owners.
     
    Resto, Sep 18, 2011
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