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Rookie Question

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by ArrowheadK5, Aug 31, 2001.

  1. ArrowheadK5

    ArrowheadK5 1/2 ton status

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    What is the difference between 3:73 axles and 3:03?

    Four wheel drive, four wheel expenses...
     
  2. gokartergo

    gokartergo 3/4 ton status Staff Member Moderator

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    I think you mean 3:08. Anyway 3:08 are a taller gear 3:73 are lower.The gear ratio depends on what you will be doing and what size tires you have.....Dan

    If it ain't broke.......Don't fix it....
     
  3. txbartman

    txbartman 1/2 ton status

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    3.73 is your gear ratio. If you search this forum on Gear ratio you will find a wealth of knowledge. Basically, this is the ratio of the set of gears in the axle differential. What it means is that for every 1 rotation of the tires, the driveshaft will rotate 3.73 times. If you have 3.08 gears, the driveshaft rotates 3.08 times for each revolution of the tires. The lower the ratio (numerically), the faster you can go top end, but you will have less get-up-and-go and could eat up your transmission. The higher ratio (numerically), the more "power" you will have, but the slower oeverall the vehicle will go.

    Typically with offroading and oversized tires, the larger the number the better (to an extent). This will transfer more power to the ground at slower speeds. Afterall, most offroading is done at low speed, not high speed. And you usually need low-end power more with a 4x4 than high-end speed.

    This is just a nutshell explanation. Like I said, search this forum for gears or gear ratio or somethign like that and you will find a whole wealth of knowledge.

    Brian
    Click to see <a target="_blank" href=http://tx85gmcguy.alloffroad.com> My 85 Jimmy </a>
    Who put a stop payment on my reality check?!?
     
  4. ArrowheadK5

    ArrowheadK5 1/2 ton status

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    I meant to type 3:07, sorry. This is what I was told this Jimmy I'm looking at has on it now.

    Four wheel drive, four wheel expenses...
     
  5. ArrowheadK5

    ArrowheadK5 1/2 ton status

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    I think I understand now-thanks guys!

    Four wheel drive, four wheel expenses...
     
  6. HarryH3

    HarryH3 1 ton status Author

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    3.07 gears and big tires make for a truck that's miserable to drive. Add at least $1,000 to the price of the rig to allow for changing the gears if you want to go the big tires route.

    <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. 1990SilveradoK5

    1990SilveradoK5 1/2 ton status

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    I agree with HarryH3 I have 3.08's and only 33's and my get up and go has got up and went.

    Gotta get those 3.73's under my truck but the $ is just not available.

    Gone Large and Loving It.
    Keith
    Manchester, MI
     
  8. gokartergo

    gokartergo 3/4 ton status Staff Member Moderator

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    I had the 3:08 with 33 inch tires. I had no get up and go. I put in 4:56 and I love it.......Dan

    If it ain't broke.......Don't fix it....
    <a target="_blank" href=http://coloradok5.com/gallery/Gokartergo>KLICK</a>
     
  9. RESTORE89

    RESTORE89 1/2 ton status

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    i also had 307 gears and 33 inch tires and i had to make an appointment to leave the stoplight
    now i have 4.11's and the thing has plenty of go and still gets almost 17 mpg on the highway at 75 mph
    if changing gears anyway i would rec going with 4.11 over 3.73 if you have an OD tranny

    It needs a bigger motor.
    what's in it now?
    doen't matter it NEEDS A BIGGER MOTOR
    89 350tbi/700r4h/np208/4.11's
     
  10. DesertDueler

    DesertDueler 1/2 ton status

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    I have 3.08s and 35s. Mines not bad, but my mtor has alot of torque. If you motor is stock or has alot of miles on it, it will very slow when you take off.

    86 Jimmy 4"lift 35"MTRs Other cars 69Firebird w/525 hp,and 70GTO live in PHX,AZ<a target="_blank" href=http://www.geocities.com/modifierperformance>My vehicles</a>
     
  11. 1990SilveradoK5

    1990SilveradoK5 1/2 ton status

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    Thanks for the advice, I have not totally made up my mind yet on the gearing. Will depend on what I find diving at the salvage yard. I would like 4.11's, can I find those in a stock truck rusting away in a yard?

    Gone Large and Loving It.
    Keith
    Manchester, MI
     
  12. ArrowheadK5

    ArrowheadK5 1/2 ton status

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    Hey, what gears are on a stock 79 k5? 87?

    Four wheel drive, four wheel expenses...
     
  13. DesertDueler

    DesertDueler 1/2 ton status

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    It depends on what the original owen choose. They could be 2.73s, 3.08s, 3.42s, 3.73s, or 4.10s. Most likely it came with 2.73s or 3.08s.

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

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