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What's your crawl ratio?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by 84_Chevy_K10, Nov 17, 2001.

  1. 84_Chevy_K10

    84_Chevy_K10 Banned

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    What\'s your crawl ratio?

    Just curious.

    Mine is currently 32.74, with 53.63 worth going in ASAP.

    How about you guys?

    Not that it matters, I rarely use low range anyway...not enough wheelspeed.

    Tim
    '84 Chevy K10, lifted, loud, fast, and 3/4 ton axles
     
  2. DesertDueler

    DesertDueler 1/2 ton status

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    Re: What\'s your crawl ratio?

    Mine is 36.56. I use low alot (rockcrawling)and thats why I still have my 208. Some day I will get a doubler though.

    86Jimmy 4"&35"MTRs,87 burb 4"&35"MT,69Firebird w/525 hp,and 70GTO live in PHX,AZ<a target="_blank" href=http://www.geocities.com/modifierperformance>My vehicles</a>
     
  3. JunkYardCrawler

    JunkYardCrawler 1/2 ton status

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    Re: What\'s your crawl ratio?

    32.32:1 in first/second(what ever you call it). and 59.14:1 in first or low.
     
  4. jekbrown

    jekbrown I am CK5 Premium Member GMOTM Winner Author

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    Re: What\'s your crawl ratio?

    How exactly are these numbers computed? My tranny is 3.06 in 1st...x-case is a 208, I forget its 4wd low gearing...and I have 4.56s in my diffs... ? =|

    J


    See the on-going build up of my '85 Jimmy! http://community.webshots.com/user/jekbrown
     
  5. JunkYardCrawler

    JunkYardCrawler 1/2 ton status

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    Re: What\'s your crawl ratio?

    i forget the formula so i use <a target="_blank" href=http://www.4lo.com>www.4lo.com</a>
     
  6. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    Re: What\'s your crawl ratio?

    47.81:1 gotta love the SM465[​IMG]

    Jek...the NP 208 has a 2.61:1 low range. 3.06x2.61x4.56=36.42:1 crawl ratio

    Rene

    <font color=green>Dyslexics of the world...UNTIE!</font color=green>
    <a target="_blank" href=http://coloradok5.com/gallery/project_T2> tRusty pics...</a>
     
  7. JunkYardCrawler

    JunkYardCrawler 1/2 ton status

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    Re: What\'s your crawl ratio?

    oh yeah. i love mine[​IMG]
     
  8. pcorssmit

    pcorssmit 1/2 ton status

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    Re: What\'s your crawl ratio?

    36:1 in the Blazer-could definitly use more, its just on the edge of acceptable.

    The funny thing is the daily driver has a 54:1. The 154" wheel base kind of negates that, though.

    Pete

    '83 K5, 350 TBI (ex 6.2), 700R4, NP208, Dana 60/14 bolt, 4.56s, Detroits, 3" lift, 15-39.5x15 TSLs
    '97 Dodge 2500 4x4 CC LB Sport, Cummins 5 spd
     
  9. Triaged

    Triaged 1/2 ton status

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    Re: What\'s your crawl ratio?

    Mine is 18.42:1[​IMG][​IMG]
    and soon to be 22.52:1[​IMG][​IMG][​IMG][​IMG][​IMG][​IMG][​IMG][​IMG]
    Gota love that 2:1 low range[​IMG]





    But at least I can go 60 on the fwy in 4 wheel Lo...don't ask.

    '71 Blazer CST w/ a 400sbc, 4" lift, 36" Supper Swampers, and alot of rust
    <a target="_blank" href=http://community.webshots.com/user/triaged>See it Here </a>
     
  10. Blazer_Boy

    Blazer_Boy 1/2 ton status

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    Re: What\'s your crawl ratio?

    My pavement pounder has 30:1. Kinda funny cause I'm making a big fuss about putting in my new 12 bolt even though the 10 would hold up to what I do.

    3.06x2.61.3.73

    "I ain't nobody, dork."
    <a target="_blank" href=http://www.geocities.com/bigkern76>http://www.geocities.com/bigkern76</a>
     
  11. rock.monkey

    rock.monkey 1/2 ton status

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    Re: What\'s your crawl ratio?

    Hummmm......70.2?
    Not bad

    Bill Innes
    88' Jimmy

    Built for <font color=blue>Function</font color=blue> <font color=red>NOT</font color=red> <font color=blue>Fashion</font color=blue>
     
  12. KENT

    KENT 1/2 ton status

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    Re: What\'s your crawl ratio?

    66.45
    SM465/NP241/3.73 gears

    It is real nice to be able to creep along over the rough stuff.

    Kent

    1989 K5
     
  13. Twiz

    Twiz 1/2 ton status

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    Re: What\'s your crawl ratio?

    Currently, the only thing crawling around here is me. Under the blazer at about 12 ft per sec...[​IMG]
    When I'm done, it should be 40.50 to one (with a doubler)
    T350/203/205/4:10 gears.
    or
    2:52 x 2.0 x 1.96 x 4.10 = 40.5 to 1

    Do you include the torque converter slip when useing an auto? Somethng like 1.8 to one I think for the converter.
    Than it would be 72.9 to one.

    <font color=blue>Twiz</font color=blue>
     
  14. K10ANDYKHAMNIC

    K10ANDYKHAMNIC 1/2 ton status

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    Re: What\'s your crawl ratio?

    i dono what mine is i have a th350 an np208 and 4.56s with 35s



    dents ....
    O R D's axles
    NO BREAKAGE :)
     
  15. mike reeh

    mike reeh 1/2 ton status

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    Re: What\'s your crawl ratio?

    what does crawl ratio signify?

    and why doesnt it change with tire size
     
  16. 84_Chevy_K10

    84_Chevy_K10 Banned

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    Re: What\'s your crawl ratio?

    Crawl ratio = transmission 1st gear x transfer case low range ratio x axle ratios

    Mine is currently 3.06 x 2.61 x 4.10
    Soon to be 6.55? x 1.96 x 4.10

    Tim
    '84 Chevy K10, lifted, loud, fast, and 3/4 ton axles
     
  17. Twiz

    Twiz 1/2 ton status

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    Re: What\'s your crawl ratio?

    Basicaly, I think it about the ability to crawl over, up and down objects in a contoled rate of speed.

    So you don't have to use momentum to get from point A to point B. (momentum is hard on parts, more so than torque. I would think) As you "gear down", torque is multiplied, and torque is what gets you moveing and keeps you moveing.
    Torque is the ability to do work (basicaly), more torque (out-right or by gearing down) the more work can be done.

    Tire size does have an effect on the crawl ratio, the larger the tire, the more ground is covered at the same R.P.M.. I don't know why it's not figured into the formula, probably due to too meny varaiables - I guess.

    <font color=blue>Twiz</font color=blue><P ID="edit"><FONT class="small">Edited by Twiztid on 11/17/01 11:36 PM.</FONT></P>
     
  18. XtrmChevy

    XtrmChevy 1/2 ton status

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    Re: What\'s your crawl ratio?

    It will be 52,87

    1981 K20 350/400/208/205 D60fARB & 14bFFDETROIT 4.10 (UNDER CONSTRUCTION!!)
     
  19. RedDwarf

    RedDwarf 1/2 ton status

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    Re: What\'s your crawl ratio?

    63.72:1
     
  20. zakk

    zakk 1/2 ton status

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    Re: What\'s your crawl ratio?

    20.82:1

    -Zakk
    '77 K5 SB 400 TH350 NP203 p/t 6" Lift D60 14BFF 4.10's 36"Wrangler II's

    [​IMG] CK5's MOAB 2002 OR BUST!! [​IMG]
     

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