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Stepping upp

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Espen88k5, Nov 30, 2001.

  1. Espen88k5

    Espen88k5 1/2 ton status

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    I'm on 35 12,5 15 Bfg mud/terrains , running 10 bolt's with 3.08[​IMG]
    So I have been looking around and look what I found for 400 US$[smilie][​IMG]
    <a target="_blank" href=http://www.espen88k5.alloffroad.com>www.espen88k5.alloffroad.com</font color=red>[/b]
     
  2. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    Well the 12 bolt would be a step up from the rear 10 bolt...however 77 might have the same gears you already have. My old 77 with 350, TH350, NP203 came with 3.08's...

    You could have better gears swapped in though.

    Rene

    <font color=green>Dyslexics of the world...UNTIE!</font color=green>
    <a target="_blank" href=http://coloradok5.com/gallery/project_T2> tRusty pics...</a>
     
  3. mudhog

    mudhog THEGAME Staff Member Super Moderator

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  4. jwduke

    jwduke 1/2 ton status

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    My old '76, had 3.73's in it too. Ran like a scalded dog with a 400 SB in it!

    1 ton '87 Chevy SWB in the making!
     
  5. Grim-Reaper

    Grim-Reaper 3/4 ton status Author

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    Look for a tag on one of the bolts on the cover of the front D44. If the tag is there it will have the Gear ratio on it. Also see if the build sticker is still in the glove box. If it's anything but the stock Gear it will be listed there.
    350's got a stock gear of 3.08
    292 I6's got a 3.73.
    Also do you know where any 87 up K5's for sale are over there? We have a new person here looking for a K5 to tow at 3000lb boat with. Look for a post from Tall_Girl.

    Women dig dents and flat paint!
    coloradok5.com/gallery/Grim
    75 Jimmy, Dollar
    Grim-Reaper
     
  6. SlyDog

    SlyDog 1/2 ton status

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    My 77 has 3.73's also

    <font color=green>[​IMG]1977 K5 GETTIN IT AWN[​IMG]</font color=green>
    BUILT NOT BOUGHT
     
  7. Espen88k5

    Espen88k5 1/2 ton status

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    I will pull both covers before I buy it anyway. So if it's not 3.73 in there I wont buy it. Good information as always, thanks!


    <font color=red><a target="_blank" href=http://www.espen88k5.alloffroad.com>www.espen88k5.alloffroad.com</a></font color=red>
     
  8. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    Well it looks like 3.73's were the gears that came with the 4 speed trucks. Slydogs is a 4 speed and so is Mudhogs 77. My 77 was a slushbox with 3.08's and as far as I know that was the standard ratio for the auto trucks in those years.

    Good luck with it Espen!

    Rene

    <font color=green>Dyslexics of the world...UNTIE!</font color=green>
    <a target="_blank" href=http://coloradok5.com/gallery/project_T2> tRusty pics...</a>
     
  9. POWERMAD

    POWERMAD 1/2 ton status

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    I think the workers at the assembly plants just tossed in whatever was handy.
    My 78 had 3:73's 12B/D44, and it originaly had a 400sb, 350/203.


    <font color=green> Too bad ignorance isn't painful </font color=green>
     
  10. schwinnd

    schwinnd 1/2 ton status

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    I just checked my ratio last weekend and I've 3.73's with a 350/th350/203 all stock. Maybe I was the lucky one.[​IMG]

    Just collecting rusty mid-70's chevy's
    1976 Blazer, 1975 Vega SW
     
  11. Grim-Reaper

    Grim-Reaper 3/4 ton status Author

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    3.73's were an option. the Lady's 79 with a TH350 has them also. It was port of the towing package. If the truck didn't have the towing package it got the 3.08's
    465's got a mix for some reason. some had 3.08's and some had 3.73. I have run across (was one Depdog parted) a 2wd K5 with a 465 with 4.10. I have the rear axle laying on my drive right now. The I6 engines it seems always got 3.73 gears to help it with the lower power it produces.

    Women dig dents and flat paint!
    coloradok5.com/gallery/Grim
    75 Jimmy, Dollar
    Grim-Reaper
     
  12. TXsizeK5

    TXsizeK5 1/2 ton status

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    Yeah i was running 35x12.50's on 3.08 gears and a really worn 305.. needless to say it really sucked.. now that i have 4.56 its great and plus... i might get a rebuild that will net alot more Hp... cant wait

    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.
     

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