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yes, yes......more about gearing

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by 85k5blzr, Mar 31, 2001.

  1. 85k5blzr

    85k5blzr 1/2 ton status

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    Ok, i must be losing my mind. From what i hear/read, you can tell the gear ratio by jacking the rear end. turning the wheel a few times, counting the times the driveshaft makes a full turn, and doing the math. When i jacked my 85 and turned the wheel 2 times, the driveshaft only turned 3 and so on. The driveshaft was turning 1.5 times for each wheel revolution, what am i doing wrong?

    85 k5 blazer with an old 305....must have more power! [​IMG]
     
  2. timebomb1602

    timebomb1602 1/2 ton status

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    what size tires??????

    1991 GMC Jimmy, 350 tbi, stock for now, but not for long!!!
     
  3. 85k5blzr

    85k5blzr 1/2 ton status

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    i'm running 32"s, but a revolution should be a revolution

    85 k5 blazer with an old 305....must have more power! [​IMG]
     
  4. Blazer79

    Blazer79 1/2 ton status

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    I think that means you have 3.07 gears. You must turn the tire twice as you thought because of the differential.

    <font color=blue>//////
    <A target="_blank" HREF=http://blazer79.coloradok5.com>http://blazer79.coloradok5.com</A>
    </font color=blue>[​IMG]
     
  5. '73 K5

    '73 K5 1/2 ton status

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    Thats just kind of an inaccurate way to do it. Depending on what kind of diff it has sometimes it works, sometimes not. Why don't you just take the diff cover off and count the teeth? Its easy to do, its accurate and more than likely the gear lube in your axle needs changing anyways.

    '73 K5
    Chevy good...Ford bad
     
  6. Goose

    Goose 1/2 ton status

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    If you have an open diff. make sure the other tire isn't turning. If you have a locking diff. make sure the other tire is turning. For higher accuracy, go through more revolutions, like 10 so the math is still easy.

    [​IMG]
     
  7. 6.2Blazer

    6.2Blazer 1/2 ton status

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    If you only turn one tire, then you have to multiply the revolutions of the driveshaft by 2.
     
  8. Emmettology 101

    Emmettology 101 3/4 ton status

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    Ya, to be more accurate, I would pull the diff cover and see what is stamped on the ring gear.

    Mike [​IMG]
    See <font color=green>EMMETT</font color=green> -&gt; <A target="_blank" HREF=http://emmett.coloradok5.com>http://emmett.coloradok5.com</A>

    "He who uses a winch...... Is tired of yankin!"
     

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