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9" ford rearend

Discussion in 'The Hokey Ass Message Board' started by flattyAndy, Jan 18, 2012.

  1. flattyAndy
    Joined: Jun 2, 2008
    Posts: 8



    i picked up a rearend with no id tag on it, a casting on it reads
    c2aw-4668 wtf is it? ratio?:mad::mad:
  2. fiftyv8
    Joined: Mar 11, 2007
    Posts: 4,856

    from CO & WA

    Probably just what you thought a casting number of litte value to tell you about ratios etc.

    Lock one end so it can not turn, then place a chalk mark on the housing where the universal connects and a similar lined up mark on the yoke.
    Then do the same with the axle end that is not locked.
    Chalk mark the housing and the rotating axle part which could be your brake drum.
    Then rotate the drum a full one turn and have it line up with the orginal unlocked end mark.
    While turning the full one turn count how many times the pinion shaft turns.
    It will be at least one turn and probably closer to two.
    Work out for example if it was 1 2/3 turns then double it and that answer will tell you very closely what the ratio is.
    In my example just given it would be approx 3.3:1
    A 4.11:1 rear should have just over two full turns of the pinion shaft and so on...

    I hope that helps you.
  3. It says it's a rear end for a 1962 full sized car.
  4. squirrel
    Joined: Sep 23, 2004
    Posts: 43,970


    That's the casting number for a pinion support.

    It's easier to figure the ratio if you turn the axle twice, or turn both axles one turn each. Then the number of turns of the pinion is the actual gear ratio.
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  5. flattyAndy
    Joined: Jun 2, 2008
    Posts: 8


    thanks man, thats good time saving info

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