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4.10's low enough?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by lifted95z71, Dec 12, 2001.

  1. lifted95z71

    lifted95z71 1/2 ton status

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    4.10\'s low enough?

    so i was using one of those gear calculators and with 4.10's id come up with about a 75:1 final drive ratio with 36's in low. this would get me about 2200 rpm @ 60 mph in regualr driving mode. any lower and my gas miliage goes strait to hell. so do yall think 4.10 will be low enough offroad? what does everyone else get for final drive ratio
     
  2. RaisedK5

    RaisedK5 1/2 ton status

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    Re: 4.10\'s low enough?

    Well, i have 36s and 4.10, and to be honest, its ok on the Freeway and around town, and is ok on the trails, but i would rather have 4.56s at least, ya i spin around 3000 at 70 and it would go up with 4.56s but its a dog on long uphills, i assume you have an overdrive tranny?? I'd go 4.56. But this is just my opinion, take it for what its worth.

    Leland aka RaisedK5

    "Of all the things I've lost, I think I miss my mind the most!"
    "Are the voices in my head bothering you?
     
  3. 2Dogs

    2Dogs 1/2 ton status Premium Member

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    Re: 4.10\'s low enough?

    What is the primary purpose of the truck. Low freeway mileage and high trail mileage would suggest you go with 4.56s.

    Dave

    Horn Broken... Watch For Finger.
    <a target="_blank" href=http://coloradok5.com/gallery/Daves-Pics>http://coloradok5.com/gallery/Daves-Pics</a>
     
  4. lifted95z71

    lifted95z71 1/2 ton status

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    Re: 4.10\'s low enough?

    not much freewawy driving just a little around town. 90% of its time will be offroad, trails mostly. i have a 4 speed stick so no overdrive.
     
  5. 81Bogger

    81Bogger Registered Member

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    Re: 4.10\'s low enough?

    If your 90% offroad..................The loooower the better man!
    [​IMG]

    <font color=red>81</font color=red><font color=blue>Bogger<font color=blue>
    "<font color=blue>Mud under tire, and Fords in the rear view...<font color=blue>" [​IMG]
     
  6. txbartman

    txbartman 1/2 ton status

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    Re: 4.10\'s low enough?

    If it's 90% offroad, I wouldn't be too concerned with your RPM at 60MPH. How often are you going 60MPH offroad anyway? If it is primarily a trail rig, I would build it as such. That would include 4.56s. I have them on my rig with 35s and love it offroad. Luckily, I have OD for the highway since mine spends more time on road than off.

    But, 90% offroad, definitely 4.56.

    Brian
    Check out <a target="_blank" href=http://tx85gmcguy.alloffroad.com>My Jimmy</a> with all her projects!
     
  7. TXsizeK5

    TXsizeK5 1/2 ton status

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    Re: 4.10\'s low enough?

    I have 4.56 and 35's and its great offraod and on the road, i never drive highway so it dont matter to me!

    6in 87' K5 w/ 35" BFG muds.
    305/Sm465/ NP208
    Kn, 4.56's.
    In desperate need of a rebuild.
    Next- Eaton mech locker... Flows.
     
  8. bigjbear

    bigjbear 1 ton status Staff Member Moderator

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    Re: 4.10\'s low enough?

    4.56s &amp; 35s and loving it.

    Jim '80 GMC & '73 Blazer
    Body by Tellico
    <a target="_blank" href=http://www.tellicok5.rockcrawler.com>www.tellicok5.rockcrawler.com</a>
     
  9. Burt4x4

    Burt4x4 3/4 ton status

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    Re: 4.10\'s low enough?

    I'm running 4.10s with 35SSRs and a SM465 4speed.
    @65 I'm turnin about 2700rpm
    My granny gear keeps me nice and slow off road.
    So far I've had the best of both worlds.
    I can see that 4.56 would give me a littel more grunt and slow me down even more but fer now 4.10s are workin fine...

    72K5[​IMG]Led Zeppelin[​IMG]Rock ON![​IMG]
    <a target="_blank" href=http://coloradok5.com/gallery/Burt4x4>http://coloradok5.com/gallery/Burt4x4</a>
     
  10. Chris Demartini

    Chris Demartini 1/2 ton status

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    Re: 4.10\'s low enough?

    <font color=blue>Your gas mileage is probably going to go to hell with 36s anyway, so I would just get the 4.56s. You'll have an easier time getting those big tires moving and you'll like it better off road.
     

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