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4.56 pinion gear in a 12B

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by CaptCrunch, Sep 28, 2001.

  1. CaptCrunch

    CaptCrunch 1/2 ton status

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    Ok guys... I am kicking around going to 4.56's gear in my rear 12B. Now before people start going a 12B sucks and all that... let me just say that I'm not concerned on axle shafts and being a C-clip design yada yada yada... I'm mainly concerned w/ the R&P... mostly the pinion gear size w/ the 4.56 gears. I know I wouldn't go over the 4.56 mark though as I know that would be too small. I would rather try finding a 14B SF to regear or maybe find a 4.56 14B FF But that leaves me shelling out for wheels too. But what is everyone's opinion on the pinion [​IMG] LOL?

    BTW... No rock crawling here... mainly tight trails and minor mud. No BBC... most I'd get in that area is a 383. Tires right now are 35" mud terrians... would like to step up to 35 or maybe 37" SSR's, but we'll see. Thanks guys and gals

    -Mikey
    1987 Chevy K5 Blazer- 350 TBI
    <a target="_blank" href=http://coloradok5.com/gallery/captcrunch>http://coloradok5.com/gallery/captcrunch</a>
     
  2. txbartman

    txbartman 1/2 ton status

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    What tranny do you have? Is it the 700?

    Brian
    A new day.... May God be with us all.
    <a target="_blank" href=http://tx85gmcguy.alloffroad.com>My Tribute</a>
     
  3. Executioner

    Executioner 1/2 ton status

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    Location:
    Temp. Ft. Walton Beach Fl. home=Tucson, Az.
    Been runing Richmond Gears 4.55:1 for 13+ years, on a GM 12 Bolt rear, with SS 36x12.5x15 . Have set them
    up twice/three times becuase I changed the carrier, have not had any problems with the pinion.
     
  4. CaptCrunch

    CaptCrunch 1/2 ton status

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    I got a 700R4 and 208 tcase for now. I currently have 4.10's but since I have a bad bearing I have to reset things up anyways so debating going to a 4.56 gear for when I step up tire sizewise.

    -Mikey
    1987 Chevy K5 Blazer- 350 TBI
    <a target="_blank" href=http://coloradok5.com/gallery/captcrunch>http://coloradok5.com/gallery/captcrunch</a>
     
  5. bigjbear

    bigjbear 1 ton status Staff Member Moderator

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    With the o/d and 35~37" tires I would go at least 4.56.

    Jim '80 GMC & '73 Blazer
    Tread Lightly!
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  6. Cmoe

    Cmoe 1/2 ton status

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    I'm running 35" and have the 4.56 in mine with a 350 Turbo....Great low end but sucks on freeway..... I want to change to a 4L60 soon.... I think you'll be happy with 4.56 and 35" You may want to go to a 4.88 if you go to 37"........

    C'moe

    Kill Roy was here!
     

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