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brain food, different diff axle ratios

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by arq, Jan 17, 2002.

  1. arq

    arq 1/2 ton status

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    what size tires would I have to use if I run an axle ratio of 3.73 on back and a 4.11 in front, or vise-versa. I am not saying that I would do it just seemed like an interesting question to ask.

    ARQ.

    offroad baja!!!
    72 4x4 CST Blazer
    71 4x4 CST Blazer
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  2. 1979Jimmy

    1979Jimmy 1/2 ton status

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    myabe 32s in the front 35s in the back...

    79 Jimmy, 5" lift 35 M/T with a 383 puttin out 400hp and 450lb/ft. 4.11s Locked front and back.
     
  3. arq

    arq 1/2 ton status

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    close but that could work.
    3.73 w/32s
    4.11 w/35.3s

    this is what I found
    3.73 w/33s
    4.11 w/ 36.4

    remember though these would have to be actual(true) tire sizes.

    ARQ.

    offroad baja!!!
    72 4x4 CST Blazer
    71 4x4 CST Blazer
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  4. Burt4x4

    Burt4x4 3/4 ton status

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    Hmmm... ARQ I think you need to GET OUT OF THE SUN!!!!!
    hehehe
    I wouldn't try to compensate for the ratio differences by changing tire size. It 'may' work but do you realy want to try??
    Slip Bang POP Crunch Snap PING............Damit I should have just match my gearsets.......[​IMG]


    72K5[​IMG]Led Zeppelin[​IMG]Rock ON![​IMG]
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  5. txbartman

    txbartman 1/2 ton status

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    Tire size is irrelevant.

    Oh, you mean and in 4WD?!? Why would you wanna...

    Seems to me the smaller gears would need more torque. So one set of tires would be eating your engine's torque versus spreading it equally between the 4. I do believe they do this in some swamp buggies to get more tire spin on the front helping to float the heavier front better while still providing deep grabbing traction for the rear. But I don't know for sure.

    My calcs say that 44s with the 3.73s would work with 40s on the 4.11s. Why not just go with 3.08s in the rear with 44s and 4.56 up front with 30s! Now THAT would look cool! [​IMG]

    Brian
    Check out <a target="_blank" href=http://tx85gmcguy.alloffroad.com>My Jimmy</a> with all her projects!
     
  6. Greg72

    Greg72 "Might As Well..." Staff Member Super Moderator

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    WOW! Talk about the "stinkbug" look!!!! [​IMG]

    That would be like a "real-life" Ed Roth RATFINK drawing....



    -Greg72

    '72 K5 Blazer - 427BB/TH350/NP205/6" Lift/35x12.50's
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  7. Blue85

    Blue85 Troll Premium Member

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    No, that's backwards. The bigger tires should go with the lower (higher number) gears. With that setup, you would have to run two spares, but maybe you could store the 30 inside the 44!

    How about just using the same tires all around with two different gear ratios, but use a 203 transfer case and just never put it in lock? It would last a little while...

    Or use a 205 case, but get a different gearset to transfer the power to the front so that it compensates for the difference in axle ratios.

    I actually always thought it would be cool to have a transfer case with 3 speeds: 1:1, 1:1.4 and 1:3. Then you would just keep your stock axle gears and use the 1:1.4 range as though you had swapped in 2-3 steps lower in the axles, use the 1:1 instead of having an OD transmission and 1:3 as a great low range. But you would want to be able to select the reduction seperate from 2WD/4WD. And of course, it would put more stress on the driveline than a real gear swap.

    <font color=green>Today's Forecast: Partly cloudy with a chance of mud</font color=green>
     
  8. Mudstud

    Mudstud 1/2 ton status

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    I have read in mags about a group of 4x4ers in Florida that run bigger tires in the rear and smaller ones up front and make up the difference in gears. They love it apparently. I also have heard of the serious mud boggers (rails) running a setup like this. The reason was the smaller tires offer better steering when you're flying accross the mud.

    Mudstud
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    76K5 6" with 33s, sb400/350/203parttime/3.73-D44/GM12bolt
     
  9. m j

    m j 1/2 ton status

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    every 4x4 tractor that has big n littles does it.
    it is easy to do the math.
    31.7?? w 3.73
    and
    35 w 4.11

    i have an exel spread sheet for side by side gear ratio comparo

    formerly 77chev
    still a jerk though
     

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