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what gear ratio in a stock 86 10 bolt?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by TIGHTWORK82 K5, Oct 21, 2002.

  1. TIGHTWORK82 K5

    TIGHTWORK82 K5 1/2 ton status

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    anyone know the ratio off hand??

    thanks, mike /forums/images/graemlins/k5.gif
     
  2. BLUESMAN

    BLUESMAN 1/2 ton status

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    Uhhh.....2.73 to 4.10's,How's that for ya??Could be almost anything.Help us help you,give us some #'s to work with.
     
  3. Pure Insanity

    Pure Insanity 1/2 ton status

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    My 86 has the ratio on the sticker in the glove box. take a look at the options sticker if its still there. If not youll have to open it up to know for sure.
     
  4. TIGHTWORK82 K5

    TIGHTWORK82 K5 1/2 ton status

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    uhh what #'s you want have not pulled the cover to check the gears. just wondering if there was a standard issue set of gears? I found gm33 on one side and b266 on the other. then 40652661 by the axle tube. /forums/images/graemlins/confused.gif
     
  5. TIGHTWORK82 K5

    TIGHTWORK82 K5 1/2 ton status

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    the truck is a 82 w/ 86 drive train go figgure
     
  6. RedneckK5

    RedneckK5 Registered Member

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    my 86 came with 3.08s. two of my buddys also came with 3.08s. pull your cover and check it out. probably needs new oil anyway.
     
  7. codeman

    codeman Registered Member

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    My 89 has 2.73's! /forums/images/graemlins/mad.gif
     
  8. rogerwilco71

    rogerwilco71 1/2 ton status

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  9. wrathORC

    wrathORC 1/2 ton status

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    Probably 2.73 or 3.08. If it had a 305 in it probably the 2.73.

    Since it's got ten bolts you can skip the 3.23. They didn't put them in a ten bolt vehicle.

    If you've got the RPO codes:
    Code Ratio
    GU2 2.73
    GU4 3.08
    GU5 3.23
    GU6 3.42
    GT4 3.73
    GT5/GT8 4.10
     
  10. TIGHTWORK82 K5

    TIGHTWORK82 K5 1/2 ton status

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    so if i have 3.08 or 2.73 /forums/images/graemlins/frown.gif what would be a good setup to go to? I have 35's on it with a new 305 hoped up a bit. when I get on it I get a good jump at first then lag then it catches up again. (does that make since) good highway speeds. over 90mph with alot more to go. but 35's get ruff at that speed. so I was wanting more low end with out sacraficing to much top end!
     
  11. wrathORC

    wrathORC 1/2 ton status

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    I'd probably go with 4.56s since you've got a 700R4. If I had a 3 speed I'd go with 4.11s.
     
  12. SkulzNBonz

    SkulzNBonz 1/2 ton status

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    Yep, probably 3.08's. I am at the same point now. 4.56's seem like the way to go, especially w/ the 305/700R4 combo.

    John
     
  13. TIGHTWORK82 K5

    TIGHTWORK82 K5 1/2 ton status

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  14. dyeager535

    dyeager535 1 ton status Premium Member

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    K5's could only get 2.73's, 3.08's, 3.42's, and 3.73's, (at least '82 and later) so that narrows it down some, if the axles are from a K5 /forums/images/graemlins/smile.gif

    Scratch that, I think the military K5's got 4.11's...
     
  15. TIGHTWORK82 K5

    TIGHTWORK82 K5 1/2 ton status

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    there might be a gt4 stamp on it too, i'll take a look when i get home
     
  16. dyeager535

    dyeager535 1 ton status Premium Member

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    just pop the covers and look for the stamped gear ratio.

    there MIGHT be a stamped in code on the passenger side axle tube about midway between the center section and wheel, facing forward as installed in the vehicle that would tell you ratio and locker/non-locker, but at this stage in our vehicles lives, the gears could have been changed numerous times.

    Is it really that bad to pop the covers, get the ratio off the gear, inspect the innards, and change the fluid? (rhetorical question, because I know the answer)
     
  17. imiceman44

    imiceman44 1 ton status

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    If you don't want to pop the cover off you can still know the ratio.
    Put it in gear, lift one tire, mark the drive shaft with a line (chalk is the best ) and mark the tire with a line (with a reference line on the fender), then rotate the tire on full turn while counting the drive shaft rotations, then multiply that by 2 (or was that divide by 2?) anyway the numbers will make it obvious. Even if you don't get the numbers exactly, you have choices for ratios and the closest one would be your ratio.
     
  18. Pure Insanity

    Pure Insanity 1/2 ton status

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    If its any help at all on semi wishful thinking on ratio, my 86 had a 305 and 3.73s. If you dont KNOW what your ratio is chances are youve never serviced the diff. /forums/images/graemlins/eek.gif Nows a good time to open it up find out your ratio and change the oil. /forums/images/graemlins/thumb.gif

    Do front and rear, ya never know what some bonehead previous owner may have swapped in. /forums/images/graemlins/rolleyes.gif
     
  19. TIGHTWORK82 K5

    TIGHTWORK82 K5 1/2 ton status

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    10-4 how much gear oil do I need to get?

    any particular brand or type?
     
  20. imiceman44

    imiceman44 1 ton status

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    around 2 qts each.
    get 5 so you make sure you have enough.
     

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