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Speed and gears

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by BillR, May 16, 2000.

  1. BillR

    BillR 1/2 ton status

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    I know you guys can help on this. I want to figure out my axle ratios. I have a TH-350, 31x10.50 tires, and a 203. Today on the interstate at 80 mph, I was running about 3100 rpm.
    I saw a formula somewhere for this equation. Do any of you know it or can point the way to it?
    Thanks in advance!

    Blazin' in Flagstaff
     
  2. Bigd

    Bigd 1/2 ton status

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    The formula is RPM/(336/Tire diam x MPH)=Ratio rear end.
    This will work with any tranny that has a final drive of 1:1.Do the calculation in () first.Save this number then divide the rpms by this number.I get 3.57 so it should be a 3.55 gear set.
     
  3. K5Junkie

    K5Junkie 1/2 ton status

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  4. Gold Rush

    Gold Rush 1/2 ton status

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  5. BillR

    BillR 1/2 ton status

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    Thanks much!

    Blazin' in Flagstaff
     

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