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Once again a tire to gear ratio question!

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by The85k5, Sep 5, 2001.

  1. The85k5

    The85k5 1/2 ton status

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    Okay you all have almost convinced me to get 4:56's with my 35's i'm running.....i've been considering 4:10's but everyone says since i have a 700r4 i should definitally go with the 4:56's. Is their anyone with 35's and 4:56's that does not like their setup? or anyone with 4:10's who would have liked to go to 4:56's?
    thanx again
    Robb
     
  2. sapper

    sapper 1/2 ton status GMOTM Winner

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    i have 4:10s on my truck with 35s and a 700r4. i think it works pretty good as a all around set up. trails and highway. i would like to put 37s under it at some time and would think about going to the 4:56s then. but i do more hardball driving than trail driving with the truck

    <a target="_blank" href=http://coloradoK5.com/gallery/Pauls89K5>http://coloradoK5.com/gallery/Pauls89K5</a>
     
  3. bigjbear

    bigjbear 1 ton status Staff Member Moderator

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    With 35s and O/D I would go with 4.88s. I have 35s and a TH350 and 4.56 gears it is a great set up as long as you don't have to drive in downtown Atlanta trafic everyday. With O/D you would have no worries.

    Jim '80 GMC & '73 Blazer
    Tread Lightly!
    <a target="_blank" href=http://www.tellicok5.rockcrawler.com>www.tellicok5.rockcrawler.com</a>
     
  4. ftn96

    ftn96 1/2 ton status

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    Jbear, I wouldn't want to drive anything into downtown Atlanta everyday.[​IMG]

    tRustyk5 for President!!![​IMG]
    <a target="_blank" href=http://www.nashvillek5.freeservers.com>www.nashvillek5.freeservers.com</a>
     
  5. ftn96

    ftn96 1/2 ton status

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    Other than a Sherman tank with the guns a blazing.

    tRustyk5 for President!!![​IMG]
    <a target="_blank" href=http://www.nashvillek5.freeservers.com>www.nashvillek5.freeservers.com</a>
     
  6. txbartman

    txbartman 1/2 ton status

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    I don't see why driving in downtown traffic would make any difference at all. I drive in Dallas traffic everyday which is as bad or worse than Atlanta. And I have no probs. But, I guess my real question is why would traffic make any difference between an O/D tranny and its gears versus a non-OD tranny and its gears. Trust me, if you are in traffic, you are probably not going into the OD gear very often. And 4.56s work great with a 700 in its low first gear for starts and stops. Sure, 4.88s would run better at starting and stopping, but your mileage knocks down another notch when out of the traffic. Stick with 4.56s w/35s and the 700.

    Another thing, if you use your rig off-road in mud (you being from the Atlanta area that is my guess as to the kind of off-roading you do), you will want the extra tire spin the 4.56s will give you versus the 4.88s. The higher the gear number, the slower the tire spins at the same engine RPM.

    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?!?
     
  7. bigjbear

    bigjbear 1 ton status Staff Member Moderator

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    The big differance is when I go to work traffic is flying. Like if I'm in the car and doing 75 MPH I get passed by most people, including the cops. I don't even slow down for a cop unless I am doing over 80 MPH. The truck tops out at about 70 MPH and it doesn't do that very well, you can mash the gas all you want, it's not going any faster. Then again, it has over 200,000 Mi on it. When I car pool with my buddy in his truck, FI 350, TH700R4, &amp; 4.88s, also on 35s we can cruise along with no problems.
    As fas as mud, yes, we have lots of slick, muddy clay on our rocks. I wheel in places like Tellico &amp; Besily Knob, I'm not into mud pits.
    Go as low as you can live with. If I had O/D I would have gone with 4.88s.

    Jim '80 GMC &amp; '73 Blazer
    Tread Lightly!
    &lt;a target="_blank" href=http://www.tellicok5.rockcrawler.com&gt;www.tellicok5.rockcrawler.com&lt;/a&gt;
     
  8. txbartman

    txbartman 1/2 ton status

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    Shoot, that's not traffic, that's highway driving. Traffic is when it takes me 1.5 hours to get to work in the morning. And I only have 18 miles to go! Now THAT'S traffic! As far as gears go, I have 4.56s, a 700, 35s, and a 305 with 240,000+ miles on it. I have no problem going well over 80 MPH. And my truck is 8' tall from the ground to the top of the lights! Big wall to be pushing into the wind. Now, I also don't go that fast unless there is serious erason to do so.

    When I had 3.73s and the same configuration, I ran only in D, wouldn't run in OD. I could still go 75+ without trouble on the highway. I was just running much higher RPMs.

    So, basically, you'll be fine with either 4.56s or 4.88s. You just have to make the call as to how low you wanna go. But 4.56s will get the job done just fine and salvage some gas mileage in the process!

    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?!?
     
  9. bigjbear

    bigjbear 1 ton status Staff Member Moderator

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    We have that kind of traffic here, too, luckly my job lets me beat it. If everything is as spread out there as it is here you know what I mean about hiway driving. I gave up on milage when my comute went from 30 Mi a day to 90 Mi a day and now I only drive it to work about twice a month. I carpool, so that's once a week when its my week to drive.
    To me ~3000 RPM at 60 MPH is about the right ballpark for a performance vehicle. That what my old Monte Carlo &amp; Camaro turnned as well. My truck is a performance vehicle, in a differant sort of way.

    Jim '80 GMC & '73 Blazer
    Tread Lightly!
    <a target="_blank" href=http://www.tellicok5.rockcrawler.com>www.tellicok5.rockcrawler.com</a>
     

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