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Axle Questions?

Discussion in '1969-1972 K5 Blazer | Truck | Suburban' started by Klef72K5, Apr 25, 2001.

  1. Klef72K5

    Klef72K5 1/2 ton status

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    Hey guys I'm getting confused here! I'm new to chevys and I would like to know are the 14 bolts a direct bolt up to a 72 Blazer or do I need to modify the spring perches? What about overall length? I also read somewhere in here that these axles are better than Dana 60's, is this true? Oh yeah one more Q what does 14 ff stand for?

    <A target="_blank" HREF=http://i12.yimg.com/12/9a062f43/h/bdb8e4e/72+Blazer.JPG>http://i12.yimg.com/12/9a062f43/h/bdb8e4e/72+Blazer.JPG</A><P ID="edit"><FONT SIZE=-1>Edited by Klef72K5 on 04/25/01 06:41 AM (server time).</FONT></P>
     
  2. Burt4x4

    Burt4x4 3/4 ton status

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    ff = Full float, means the rear has a hub like the front so the wight of the rig is on the wheel bearings instead of the axel itself. The D60 is lighter and has a slight advantage for ground clearance over the 14bolt. The main diff is that the pinion gaer on a 14 bolt has an end bearing on it. I forget what it is called, load bearing I think? Also the drums on a 14bolt are bigger. For a K5 A D60 is pleanty strong. The 14bolt is more popular cuz they are cheaper and readly found in any junk yard. I have a D60 rear so don't know if the 14bolt's perch needs to be moved or not?
    Good Luck

    72K5[​IMG]Led Zeppelin[​IMG]Rock ON![​IMG]
    <A target="_blank" HREF=http://www.burt4x4.coloradok5.com>http://www.burt4x4.coloradok5.com</A>
     
  3. californiak5

    californiak5 1/2 ton status

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    I'll pick up where Steve left off. If you get a 14B out of a 3/4 ton you will have to move the spring perches and the shock mounts. If you get a 14B out of a 1 ton you will only have to move the shock mounts. That is for 69-72's, it is the reverse for the people who own a 73 on up

    See Ya,
    Keith

    [​IMG] <font color=green>Born to Drive My K5</font color=green> [​IMG]
     
  4. R72K5

    R72K5 Banned

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    What load rating are the 14 bolt single wheel corps ?

    The Dana 60 are 5500lb

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

    Ryan_B Registered Member

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    Basically what it boils down to is the size of the ring gear determines the strength of the differiential.
    Bigger is better.
    Remember the 14 bolts are much, much heavier though, than a 12 bolt
    i think over 60 lbs. heavier

    10 bolt = 8.5" ring gear
    12 bolt = 8.875 (or 8 7/8") ring gear
    Dana 60 = 9.5" ring gear
    14 bolt sf (semi floater) = 9.5" ring gear
    14 bolt ff (full floater) = 10.5 ring gear
    Dana 70 = 10.54" ring gear
    So i'd say the 14 bolt could probally hold up to more abuse, but if ground clearance is an issue on the trail with lots of rocks to snag your diff. the Dana 60 has higher ground clearance.
    You can shave the bottom of the Dana 60 more than the 14 bolt with a grinder to improve ground clearance even more.

    Check out
    www.mindspring.com/~themclains/axlefacts.htm
    www. redlineoffroad.com
     

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