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3/4 ton or 1 ton?

Discussion in '1969-1972 K5 Blazer | Truck | Suburban' started by roostr3269, Oct 28, 2001.

  1. roostr3269

    roostr3269 1/2 ton status

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    i have half ton running gear right now, and was toying with the idea of going to 1 ton until i started checking for the availability of parts for them. I have been told by several local wheelers that 3/4 ton would hold up fine for me. I am putting a 396 in soon , and i have a th350, np205, 37"ssr's, and 11 inches of lift. i live in michigan, so i will basically be in sand, mud, hillclimbing. my hole problem is i am going to a crossover steering kit, so i need to figure out what front axle i am going to use so i can order it up. any ideas any1?

    live to wheel, wheel to live--1972 gmc jimmy 8 inch lift, 37" ssr's, big n bad
     
  2. DesertDueler

    DesertDueler 1/2 ton status

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    I say just go with 3/4 ton. You can find axles anywhere for a dana 44. You dont really need a dana 60 unless you do alot of rockcrawling. Stay with a dana 44 and put the extra money into the crossover.

    86Jimmy 4"&35"MTRs,87 burb 4"&35"MT,69Firebird w/525 hp,and 70GTO live in PHX,AZ<a target="_blank" href=http://www.geocities.com/modifierperformance>My vehicles</a>
     
  3. POFF

    POFF 1/2 ton status

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    For the rear: The 14 bolt is the same for 3/4 ton and 1 ton. But you want the 1 ton because of the spring pad spacing. For the front: I have a Dana 44 in my 3/4 4x4 and it holds up fine. But, the crossover steering conversion is a pain in the ass. You have to mill and drill the steering knuckle. That's a lot of work to put in to a Dana 44. The Dana 60 crossover is bolt on! You can convert your current Dana 44 to 3/4 ton by changing everything from the caliper bracket out, the axle shafts are the same, just make sure you have the heavy-duty axles.

    Never said I could spell!
    '70 K-20 San Diego, CA
     
  4. ed rex

    ed rex Registered Member

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    Huh? Rear 3/4 and 1T 14 bolts the same? I was under the impression that the difference, besides the spring pads, were that the 1T has full floating axles and the 3/4 does not. My 1T has the full floaters but my buddy's 14bolt does not. What's the scoop?
     
  5. arq

    arq 1/2 ton status

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    i belive the differnece is the spring pad and the brake drum size.

    ARQ.

    offroad baja!!!
    72 4x4 CST Blazer
    71 4x4 CST Blazer
    <a target="_blank" href=http://coloradok5.com/gallery/ArqDennis>My Pics</a>
     
  6. R72K5

    R72K5 Banned

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    POFF is referring to the bigger (10.5" ring gear)14 bolt rear axle that is under the 73-up trucks, and is stil being used today under the new trucks.
    This 10.5" ring gear 14 bolt axle is under both 3/4 and 1 ton, and is full floating under 3/4 and 1 ton. The only difference is whether is dually or not( applies to 1 ton trucks of course)

    In the '67-72 era all of the 3/4 ton trucks used either the full floater Corp 10 bolt axle or the full floater Dana 60 axle.(mostly only with the optional rear leaf type suspension ordered- or with the BB engine option)

    Tthere were no 3/4 ton trucks in that era that were not with a full float rear end.


    Some time after 73, the 9 1/2" ring gear 14-bolt was used- it is not a full floater and it has a weaker one-piece syle pumpkin housing. This axle pumpkin looks almost same as a 12-bolt 1/2 ton axle, but is a tiny hair bigger- only by .625" (ring gear dimater difference)

    Some of the 10.5" 14-bolt axles are dually conversion for use under some of the 1 tons.

    Bottom line is that most all 73-up 3/4 ton trucks are full floating, but not all, especially after '80 or '81 or so.

    The 10.5" 14 bolt corps are very common and very strong, and damn near indestructable.
    Dana 60's have the advantage of more ground clearance though. Taller tires fixes that clearance problem with the 10.5" axles.

    A 1 ton 10.5" 14 bolt corp wil bolt directly onto 69-72 K-5/10 leafs, the pads are set same distance apart,

    And the 3/4 ton 10.5" 14 bolt corp wil not bolt onto a 69-72 K5/10 truck.

    hope i helped and didnt make this more confusing

    '72 K-5 4x4, CST, 3.07, 4 speed, NP 205, 31' x 10.5", Olive green and primer, rusted out, rice smasher!
     
  7. roostr3269

    roostr3269 1/2 ton status

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    cool, i think thats the plan of attack then, a lot of other local wheelers i have talked to say the same thing, thanx for the input

    live to wheel, wheel to live--1972 gmc jimmy 8 inch lift, 37" ssr's, big n bad
     
  8. roostr3269

    roostr3269 1/2 ton status

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    how do u know if u have the heavy duty axles, r u talking a bout the axle i have in there right now? axle housing?

    live to wheel, wheel to live--1972 gmc jimmy 8 inch lift, 37" ssr's, big n bad
     
  9. californiak5

    californiak5 1/2 ton status

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    If you have the stock rear axle in your 72 I would bet it is the 12 bolt. Those have the standard 1/2 ton drum brakes on them. They are not bad axles, but with 37" tires on it I would want something a little bigger.

    Check out this link for identifying axles. <a target="_blank" href=http://coloradok5.com/axleguide.shtml> Axle Guide</a>

    See Ya,
    Keith
     
  10. POFF

    POFF 1/2 ton status

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    Heavy Duty axles: Sometime in the early 70's they switched to heavier duty front axle shafts in the Dana 44s. The difference is obvious. The early ones the spline diameter is noticably larger than the axle shaft. The heavy duty shafts are larger in diameter than the splines.

    14 Bolts: R72K5 is correct, I was refering to the 10.5" 14 Bolt. The 3/4 ton vs. single tire 1 ton. Dually axle is useless for our trucks (unless you want duals).

    Brakes 11" and 13" were both options on the 3/4 ton axles, the 1 tons may have all been 13". I found 11" brakes to be suffecient on my '70 K-20 (and I tow stuff, heavy stuff). I also found the 11" brake parts slightly cheaper and easier to find.

    I have some info I wrote on the subject after converting my '70 K-20 and my friends '69 K-5 to 14 bolt rears and front disc brakes. I can e-mail to anyone who wants it. I'll update it after we finish the D-60 fornt conversion and disc brake rear conversion on the K-5 (be a few months).

    Never said I could spell!
    '70 K-20 San Diego, CA
    <P ID="edit"><FONT class="small">Edited by POFF on 10/30/01 09:45 AM.</FONT></P>
     
  11. POFF

    POFF 1/2 ton status

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    ed:

    There is a semi-floating 14 bolt in some of the late 70's or early 80's 3/4 tons. This is the exception, and I've heard nothing good about them.

    FYI: I used a 3/4 ton axle, I just had to have the spring pads moved. To move the spring pads and shock mounts was about $150. If you use a 2 wheel drive axle have them shorten the shock mounts.

    Never said I could spell!
    '70 K-20 San Diego, CA
    <P ID="edit"><FONT class="small">Edited by POFF on 10/30/01 09:49 AM.</FONT></P>
     
  12. roostr3269

    roostr3269 1/2 ton status

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    i just talked to a friend yesterday that found a truck( he said 25 years old?)3/4 ton pickup with 3/4 ton axles under it, he wants susp. lift and rims and tire off it, i get axles and whatever is left for $800.00. not sure what i am going to do at this point. yes my jimmy has 12 bolt rear and d44 up front. the truck i might buy has 14ff and d44 up front.

    live to wheel, wheel to live--1972 gmc jimmy 8 inch lift, 37" ssr's, big n bad
     
  13. R72K5

    R72K5 Banned

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    some- (a few)- after '81 or so(and up) 3/4 tons have the 9.5" SF 14-bolt which is not a FF axle.
    But you dont see them anywhere near as often as the better(best) 10.5" FF axle. I owned an 81 C20 last summer that I sold it was a semifloat with 4speed 465 and 305 4bbl with EST. I was very surprised to find that when I pulled the hubcaps off the rear wheels that it had no hubs ! I was like uhmmm, so I proceeded to learne verything I possibly could about the 73-up 3/4 tons, also,

    I already know all about the rear 67-72 axles-
    - the 5200lb Dana60(4.10 3.54 with BB engine- and 4.56),
    -the 5200lb 3/4 ton corp(4.57), -the 7200lb(5:14 in 67 and 4:57 in 68-72) 1 ton corp,
    -the very optional and uncommon 11,000lb 1 ton corp axle with drum type parking brake and 6:17 gears..

    No one wants the 9.5" SF- and no one puts them under their 69-72 trucks, they basically go to scrap with the trucks they are on(when its time for that) the wheels wont go on a 10.5" FF from a 9.5" SF, nothing at all is the same. And some applicatins of the 9.5 are 6 bolt instead of 8, and yes on 3/4 ton as odd as it sounds.

    good luck

    '72 K-5 4x4, CST, 3.07, 4 speed, NP 205, 31' x 10.5", converting to 2wd and pickup body(I did not want to do this- rust made me do it)
     
  14. californiak5

    californiak5 1/2 ton status

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    What was in a 1970 3/4 ton Camper special 2 wheel drive. It looks just like a D60 but someone said it was a Eaton rear end. Do those two rear ends look alike? Thanks for your help.

    See Ya,
    Keith

    [​IMG] <font color=green>Born to Drive My K5</font color=green> [​IMG]

    <a target="_blank" href=http://coloradok5.com/gallery/californiak5>CaliforniaK5's Pictures</a>
     
  15. R72K5

    R72K5 Banned

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    no, they do not look anything alike in any way

    Eaton/Corp axles have a salad bowl perfectly round cover, and the dana60 and dana44 have same cover, is all irregular shaped. all of the corp/eaton and dana axles are 10 bolt


    '72 K-5 4x4, CST, 3.07, 4 speed, NP 205, 31' x 10.5", converting to 2wd and pickup body(I did not want to do this- rust made me do it)
     
  16. roostr3269

    roostr3269 1/2 ton status

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    thanx for the info, i will keep u guys posted on the progress

    live to wheel, wheel to live--1972 gmc jimmy 8 inch lift, 37" ssr's, big n bad
     

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