Gear Ratios: Misinformation at its worst.

Discussion in 'Experienced Truckers' Advice' started by Hammer166, Apr 28, 2021.

  1. Old Man

    Old Man Road Train Member

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    Back in 1980 my friend had a gmc general, 8v92 with a 13 speed with a 4 speed auxiliary, never did run out of gears on the top side, probably could have hit 100 and still had 13 gears left.
     
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  3. REALITY098765

    REALITY098765 Heavy Load Member

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    Taller and shorter refers to the diameter of the ring gear
    When installed they are on edge and 1 is taller than the other.
     
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  4. REALITY098765

    REALITY098765 Heavy Load Member

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    Back in the day when 12 bolt rear was the thing to have in a GM. You can't put 456 gears in a 3 series carrier and you can't put 308's in a 4 series carrier. Well without serious modifications you can;t.
     
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  5. Hammer166

    Hammer166 Crusty Information Officer

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    While there is a difference in size, your premise is exactly opposite of how the taller/shorter vernacular works.
     
  6. God prefers Diesels

    God prefers Diesels Road Train Member

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    "Taller" "Higher" "Longer" refer to higher gears. (Lower number gear ratio)

    If you have 4.11's, and 3.54's, the 3.54's are the taller, longer, higher gear of the two.
     
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  7. God prefers Diesels

    God prefers Diesels Road Train Member

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    Rear end gear ratio is the number of teeth on the ring, divided by the number of teeth on the pinion. Not really sure what you're talking about, or if I missed part of the conversation.
     
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  8. REALITY098765

    REALITY098765 Heavy Load Member

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    Yes , What did I say?
    The ring gear tho Not necessarily the pinion.
     
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  9. God prefers Diesels

    God prefers Diesels Road Train Member

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    You said the ring that's bigger is the taller gear, and it gets it's name because it has a larger diameter. If it's got a larger diameter, it takes more revolutions of the pinion to turn it. That means the larger ring is a shorter gear, not a taller gear.

    Unless I'm just completely misunderstanding what you're getting at.
     
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  10. wore out

    wore out Numbered Classic

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    They make a spacer and longer bolts to put say 4.11 on a carrier that had 3.08 or where ever the split was. The ring is the same diameter on both. The pinion is bigger in circumference on higher gears is why the back spacing is different. You cannot however use a 4.11 carrier with 3.08
     
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  11. REALITY098765

    REALITY098765 Heavy Load Member

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    If you do the math you don't get an exact number like 354 or 355 that number is rounded off from a longer number.
    The answer to the equation is stated as 3.55 to 1.

    41divided by 10 is 4.1 so the ratio of the gears is 4.1-1 and 4.10-1 is the same answer. The 0 means nothing.
    Also 37 teeth divided by 9 teeth is still 4.1-1 ratio.
     
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