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Axle Ratio?????

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Dave, Sep 22, 2000.

  1. Dave

    Dave Registered Member

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    I just bought another truck last night (yea!!!), though it's not a Blazer (close enough). It's an '84 K-15 pickup. Mostly rust free (next to impossible in Wisconsin) for only $400! It origionally had a straight 6 and an SM465. Last owner had a 350 4 bbl swapped in and kept the SM465. Still has 10 bolt front and rear axles. I checked the glove box for ratio codes, and only came up with:

    G80 - Limited Slip
    GQ1 - "Standard ratio for merchandise pkg."

    Anyone have an idea what the standard ratio is? The truck is very plain, just a standard Sierra, not a Sierra Classic or High Sierra. No big deal if no one knows, as I'm asking for a 60 and 14 ff for Christmas :)



    Dave Hiller
    90 K-5
    "The Anti-SUV"
     
  2. 90K5

    90K5 1/2 ton status

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    With a manual my guess would be 3.08 or 2.73

    90K5
     
  3. Brady

    Brady 1/2 ton status

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    Look on the front axle for a tag on one of the diff bolts.Probbally 3.08s or 2.73 though.Since it is standard issue.Brady

    '73Beautiful Disaster
     
  4. 82GMC

    82GMC 1/2 ton status

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    Check this site out he has charts that will tell you what ratio your truck came withhttp://www.chuckschevytruckpages.comThis site has lots of other info too so check it out everybody.

    [​IMG]Inline 6's make a lot of noise[​IMG]
     
  5. 82K5

    82K5 1/2 ton status

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    standard ratio is 3.08. if you can get the numbers off of both axles i can tell you when and where it was made and the gear ratio.

    Phil in K.C.
     
  6. Blazer1970

    Blazer1970 1/2 ton status

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    Since it originally had a 6 cyl. it may have had lower gears standard, possibly 3.73s.

    Tim

    1970 Blazer CST 4X4 350 SM465 NP205
    1987 Suburban 4X4 350
    1988 Chevy Pickup 4X4 350
     
  7. 82K5

    82K5 1/2 ton status

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    could be. i do have the gm book that would tell if he can find the numbers on the axles.

    phil
     
  8. My 82k5 has factory 3:73's,its an auto truck though.Take the covers off and count the teeth.Its the only way to realy know for sure what you realy have.
    Good luck.

    IF IT AINT BIG IT AINT BAD!!!!!!
     
  9. 82K5

    82K5 1/2 ton status

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    ahhh, but there's the rub. 3.08's are the standard ratio. i would love to have 3.73's, but i got the standard ratio.

    phil
     

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