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1/2 tom, 3/4 ton. What do I have

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

  1. Sammy

    Sammy 1/2 ton status

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    Honestly, I do not know. An 88 K5. what is it? 3/4 ton?

    "K5 Grand GT Blazer Silverado in the Netherlands."
     
  2. shupach

    shupach 1/2 ton status

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    look at the side of your truck if it says 1500, then its a 1/2 ton, if it says 2500 then its a 3/4 ton, 3/4 ton's are rare, i think they only made them for the army, or at leats to the best of my knowledge(dont quote me).

    phill
     
  3. BadDog

    BadDog SOL Staff Member Super Moderator Author

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    Unless it has been modified, all K5s come with 1/2 ton axles. Earlier models had D44/C12 and later models (like the 88) came with C10/C10. It changed sometime around 1980 but I don’t remember the exact year. Even the military models had 1/2 ton axles unless there are some that I don't know about.

    Bad Dog

    85 K30 CUCV, 350 TBI, TH400, NP205, D60/C14, 4.56
    Coming soon: 4" lift, 40" tires, massive cutting, shorter wb and rear overhang.
     
  4. Whassup

    Whassup 1/2 ton status

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    I have never seen a CUCV K5 that was a 3/4 ton. The military didn't special order CUCV's anyhow, they mass ordered them. I checked on the 10 my unit has and all the VIN's are in sequence. They are all 1/2 ton diesels with a 700R tranny.

    I like my trucks BIG, my women HOT, and my Budweiser COLD!
     
  5. LittleJimmy

    LittleJimmy 1/2 ton status

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    Count the bolt pattern on the differential cover. 10 bolts is a 10 bolt. 12 bolts is a 12 bolt 14 bolt are 14 bolts. 10 bolt 1/2 ton, 12 bolt 3/4 ton 14 bolt 1 ton which is the best but I am sure you don't have that unless someone put them on.
     
  6. BadDog

    BadDog SOL Staff Member Super Moderator Author

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    Eh, no offense but 12 bolt is half ton (including heavy half in the older trucks).

    On the 14s in lighter trucks, it depends on the year and options but there are 2 of them. I’m not 100% sure on the specifics of which one is found where and when but it works out roughly like this. The 14 semi-float (weaker of the two) is used for the 1500 HD (I think) and 3/4 in later models. The 14 full float is used for older 3/4 and newer 2500 HDs. I think that is close to correct, I'm sure others will point out any mistakes.


    Bad Dog

    85 K30 CUCV, 350 TBI, TH400, NP205, D60/C14, 4.56
    Coming soon: 4" lift, 40" tires, massive cutting, shorter wb and rear overhang.
     
  7. dyeager535

    dyeager535 1 ton status Premium Member

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    Funny thing is, the Army CALLED them 3/4 tons on the paperwork. I assume only because ALL of them had the 3 leaf front, 6 leaf rear springs, which I believe was just the towing package from GM. The 1 ton trucks were/are called 5/4 ton on Army paperwork, (which would be 1.25 tons of course) but are just 1 tons, albeit I assume with the heaviest GVW they could get. None of our K5's had 700's..they all had 400's, and so does the 5/4 ton truck. The early (80's) HMMWV's had 400's also, only later on went to the 4L80(E? I doubt it)

    Dorian
    My K5 and Chev/Olds tech/links page: <A target="_blank" HREF=http://www.dorianyeager.com/index2.html>http://www.dorianyeager.com/index2.html</A>
     
  8. Sammy

    Sammy 1/2 ton status

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    I'm asking this because it is a quastion on the http:// www.4wheelparts.com website for lift kits. I have a 10bolt front and a 12bolt rear. Which lift you guys recomend me. I do not do any extreem off roading. Only medium.



    "K5 Grand GT Blazer Silverado in the Netherlands."
     
  9. slider79blazer

    slider79blazer 1/2 ton status

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    look at your bolt pattern for your rims. 6 bolts= 1/2 ton, 8=3/4 ton.

    whats a 4 letter word for farm wagon? (ford)
     
  10. 6.2Blazer

    6.2Blazer 1/2 ton status

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    BadDog is correct, 12-bolts were only offered on 1/2 ton trucks back in the 70's and very early 80's until it was replaced with the 10-bolt. I've noticed a couple of posts lately with people saying 12-bolts were found in 3/4 tons and I don't know where that information is coming from.

    Here's the scoop from what I have gathered over the years on rear axles:
    Please remember that these years are all approximate. There's also a lot of older GM trucks running around with non-stock components.

    1/2 ton/1500 series (including K5's which were all considered 1/2 ton) - 12 bolts from somewhere around late 60's up to around '80 or '81 when they were discontinued, then replaced with 10-bolts which is still currently being used. There are a few newer ('88 and newer) 1500's with the trailer towing package running around with 6-lug SF 14 bolts. Rumor has it that some of the 80's "heavy half" models had a 5 or 6 lug SF 14, but I have never heard enough evidence to be convinced for sure.

    3/4 ton/2500 series - starting in early '70's (maybe '73 with the redesigned body) they used the 14-bolt FF up to the very early '80's, then the SF 14-bolts began to appear. All that I have seen up to '87 always had 8-lug wheels. All of the '84-'87 year trucks around here seem to have the SF 14 bolt, but they could have also offered the FF 14 bolt. Starting in '88 with the new style, GM began offering a light duty 2500 series with a 6-lug SF 14 bolt and a heavier duty model with an 8-lug SF 14.

    1 ton/3500 series - most used the FF 14-bolt, with some duallys using a Dana 70
     
  11. 89Blazin

    89Blazin 1/2 ton status

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    Go to coloradok5.com/axleguide.shtml.....12 bolt was in 1964-82 GM 1/2 and 3/4 ton rearends. Pictures and everything....

    85 Burb and an 89 Blazer
    One just for fun, one simply for pleazer
     
  12. BadDog

    BadDog SOL Staff Member Super Moderator Author

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    Hmmm, I see it on the page but I have never seen or heard of a 12 bolt in a 3/4 ton. Has anyone ever seen one? Were they 8 lug?

    Bad Dog

    85 K30 CUCV, 350 TBI, TH400, NP205, D60/C14, 4.56 Locked
    Soon: 4" lift, 40" tires, massive cutting, shorter wb and rear overhang.
     
  13. 76chevy

    76chevy 1/2 ton status

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    Just count your lug nuts as was said earlier. 6 = 1/2 ton. 8 = 3/4 ton. They just want to know because the ubolts are different to fit the different axles. Don't get the Heavy Duty springs unless you carry alot of heavy stuff or have a massive bumber and winch. The springs are very stiff.

    You should look up the axle guide just so you know which axle you have anyway. It will come in handy in the future.

    <font color=red>Spirit of 76</font color=red>
     
  14. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    The 12 bolt was never in a 3/4 ton. If I'm not mistaken the "axle guide" at one time listed a 12 bolt front too...[​IMG]

    Just because its in 'print' doesn't mean its true!

    Rene

    [​IMG]<A target="_blank" HREF=http://jules.coloradok5.com>http://jules.coloradok5.com</A>
     
  15. BadDog

    BadDog SOL Staff Member Super Moderator Author

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    Yeah, that's kind of what I was thinking. That's why I asked if anyone had ever heard of such a thing. I wasn't going to come out and say "Bull #$#$!!" which was my first thought. [​IMG] It wouldn't be the first time I was surprised by finding that what I thought was fact is actually shall we say, not. [​IMG]

    Bad Dog

    85 K30 CUCV, 350 TBI, TH400, NP205, D60/C14, 4.56 Locked
    Soon: 4" lift, 40" tires, massive cutting, shorter wb and rear overhang.
     
  16. 84K5WITHAJUNK305

    84K5WITHAJUNK305 Registered Member

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    Here's what's really great. I have a '77 SWB chevy(2wd unfortunately) that is a 3/4 ton. It was ordered with the trailering package which was good for an 8000lb GVWR, but makes it ride like a tractor. Hit a speedbump at 20 and knock yourself unconcious on the roof of the cab!

    A broken 84 k5 and lots of mud, it sucks to be me
     
  17. HispanicPanic

    HispanicPanic 1/2 ton status

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    if it looks stock its more than likely a 1/2 ton

    <A target="_blank" HREF=http://jimjim.coloradok5.com>http://jimjim.coloradok5.com</A> [​IMG]
     

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