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rear end gear ratio

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by xnoahx, Jun 6, 2001.

  1. xnoahx

    xnoahx 1/2 ton status

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    ok, im trying to figure out what gears i have in my 12 bolt and im not sure how to do this. I know i can jack up the rear and spin the tire and count the turns of the drive shaft but how do i interpert that?

    Check out my 73 K5 http://members.theglobe.com/xnoahx/73k5.htm
     
  2. rocko

    rocko 1/2 ton status

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    I believe you put a mark on the pinion or driveshaft.. then put a mark on the tire.. then rotate the tire and count how many times the pinion spins for one tire rotation using the mark.
    That's how i've seen it done.

    Experience is something you don't get until just after you need it. <A target="_blank" HREF=http://www.rocko.coloradok5.com>http://www.rocko.coloradok5.com</A>
     
  3. dyeager535

    dyeager535 1 ton status Premium Member

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    If you REALLY want to know for sure what they are, pull the diff cover off, (tires off the ground) and rotate the ring gear (big one) until you see the stamped in ring/pinion count. Divide big number by little number, and you have the exact ratio. Doesn't hurt, since diff fluid is rarely changed, and it will give you an idea if anything is going wrong in there, or if everything is in ship-shape.

    Dorian
    My tech/links page: <A target="_blank" HREF=http://www.dorianyeager.com/index2.html>http://www.dorianyeager.com/index2.html</A>
    No anti-theft measures on your truck? No pity when its stolen
     
  4. xnoahx

    xnoahx 1/2 ton status

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  5. Triaged

    Triaged 1/2 ton status

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    90 weight gear oil.

    '71 Blazer CST with alot of rust
     
  6. Derf00

    Derf00 1/2 ton status

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    It's two rotations of the tire, and if you do it carefully it is fairly accurate. Three rotations of the drive shaft, 3.08, almost 3.5 rotations 3.42, almost 4 3.73, etc.

    Derf00
    http://www.derf00.coloradok5.com
    "Four wheel drive allows you to get stuck in a more inaccessible place."
     

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