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Stock gears in 14 bolts & 60s?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Mudstud, Dec 18, 2001.

  1. Mudstud

    Mudstud 1/2 ton status

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    OK, I hear everyone say that their gears are 4.11s or 4.10s. Are these different names for the same ratio? What came stock in the Chevy 60s and 14 bolts? If they are different then what do you think about running 4.11s in one end and 4.10s in the other? Why do I ask?- because it seems like I can find the front and rear ends but the gears don't match EXACTLY. I'm confused!

    Mudstud
    <a target="_blank" href=http://communities.msn.com/OffroadK5s>http://communities.msn.com/OffroadK5s</a>
    76K5 6" with 33s, sb400/350/203parttime/3.73-D44/GM12bolt
     
  2. wayne

    wayne 3/4 ton status

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    Alot of them are a little off like that. It is normal and ok.

    See <a target="_blank" href=http://coloradok5.com/gallery/Waynes-Toy>Project Mighty Mouse</a> here.
    <font color=blue>Wayne<font color=blue>
    <font color=blue>Happy Trails<font color=blue>
     
  3. txbartman

    txbartman 1/2 ton status

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    Some variance in the gear ratios are acceptable. Difference between 4.10s and 4.11s is less than 1/2%. Per <a target="_blank" href=http://www.ring-pinion.com>Randy's Ring &amp; Pinion</a>, you can have as much as 1% variance in the gears and everything still function well on-road and as much as 2% and still function well off-road. To find the difference, divide the ratios and subtract 1 and multiply by 100. For example, 4.11/4.10 = 1.0024. Subtract 1 = .0024. Now multiply by 100 = .24% difference between the two gears.

    Brian
    Check out <a target="_blank" href=http://tx85gmcguy.alloffroad.com>My Jimmy</a> with all her projects!
     
  4. four_by_ken

    four_by_ken 1/2 ton status

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    I agree with the other responses. That small of a differance wont hurt a thing.

    Ken H.


    '86 K5 in parts
    14 bolt and Dana 60
    44 TSLs
    468 BBC, 350 trans, 205 transfer
    Rust free in Michigan!
     
  5. blazen_md

    blazen_md 1/2 ton status

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    If it was 3/4 ton truck 14 bolt rear it probably had 3.73's in it
     
  6. HarryH3

    HarryH3 1 ton status Author

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    It depends on the year of the truck. Back in the early 70's, 4.10's and 4.56's in trucks were very common. As gas mileage became a concern, those ratios got more and more rare. [​IMG]

    <font color=black>HarryH3 - '75 K5</font color=black>
    <a target="_blank" href=http://www.angelfire.com/super/ThunderTruck>www.angelfire.com/super/ThunderTruck</a>
    It's a great day to be alive...
     
  7. 6.2Blazer

    6.2Blazer 1/2 ton status

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    These are close enough it will make no difference. The normal tolerance in tire sizes and air pressure can make that much of a difference.

    Different axle designs and sizes mean that a different number of gear teeth on the pinion and ring gear have to be used to get a similiar ratio, meaning that there can be a slight difference in the number. For example, 4.09, 4.10, and 4.11 should be treated as basically the same gear ratio.
     
  8. Mudstud

    Mudstud 1/2 ton status

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    I was refering to the years 73 thru 87. Thanks guys that helps.

    Mudstud
    <a target="_blank" href=http://communities.msn.com/OffroadK5s6superliftand33s.msnw?albumlist=2>http://communities.msn.com/OffroadK5s6superliftand33s.msnw?albumlist=2</a>
    76K5 6" with 33s, sb400/350/203parttime/3.73-D44/GM12bolt
     

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