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Do 3:73's & 3:69's match?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Ryan B., Oct 23, 2002.

  1. Ryan B.

    Ryan B. 3/4 ton status GMOTM Winner

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  2. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    Re: Do 3:73\'s & 3:69\'s match?

    Yes they do. The difference is actually .0349, not .04.

    Rene
     
  3. Ryan B.

    Ryan B. 3/4 ton status GMOTM Winner

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    Re: Do 3:73\'s & 3:69\'s match?

    Right...
    0.0349 difference...

    So what is the limit or rule of thumb for how much difference you can have? is it 0.10 difference?

    I guess the Dana60 48:13 which calculates to 3.69230 gear ratio... is what youd call a "3:73" ratio since its close enough.
    Thanks Rene. /forums/images/graemlins/grin.gif
     
  4. wrathORC

    wrathORC 1/2 ton status

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    Re: Do 3:73\'s & 3:69\'s match?

    1% is the rule of thumb.

    Furd is notorious for having different ratios front and rear. 'nother reason Furds are failures.
     
  5. bajaviking

    bajaviking 1/2 ton status

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    Re: Do 3:73\'s & 3:69\'s match?

    As far as I know the rule of thumb is 1% difference is allowed, which is about what you will have in this case.
     
  6. Leadfoot

    Leadfoot 1/2 ton status Premium Member

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    Re: Do 3:73\'s & 3:69\'s match?

    Rene, how'd you get those numbers. I though % difference was derived by 1-(3.69/3.73)= .01072 That times 100 (for %) equals 1.07% (close enough to 1). Am I calculating incorrectly? I ratio minus another gives mathematical difference, not % difference. Maybe that is what to look for /forums/images/graemlins/confused.gif /forums/images/graemlins/1zhelp.gif
     
  7. Troopie's Tonka

    Troopie's Tonka 1/2 ton status

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    Re: Do 3:73\'s & 3:69\'s match?

    haha..smart ass /forums/images/graemlins/ears.gif
     
  8. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    Re: Do 3:73\'s & 3:69\'s match?

    Chris...I never figured out the percentage difference, but I could see it was within 1%. I did have the decimal point over too far though./forums/images/graemlins/blush.gif I should re-read my replies a little more carefully sometimes.

    Rene
     
  9. Leadfoot

    Leadfoot 1/2 ton status Premium Member

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    Re: Do 3:73\'s & 3:69\'s match?

    I wasn't trying to be a smartass /forums/images/graemlins/blush.gif
    I just saw that Rene had posted "The difference is actually .0349", which is a mathematical difference and should not be used for calculating % difference (which is what gear ratio difference is based on for acceptability). I think I got the formula from one of the R&P sites to calculate and just wanted to make sure people didn't make a mistake that could cost them there driveline components. I could have been wrong too, that is why I was asking. /forums/images/graemlins/ears.gif /forums/images/graemlins/thumb.gif
     

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