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14 FF swap

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by FatBoyBlazer, Jun 9, 2001.

  1. FatBoyBlazer

    FatBoyBlazer 1/2 ton status

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    is there a 14 FF that would just bolt up with no mods? also what is a strong axle for the front that is 8 lug, or can i convert a corprate 10 bolt over to an 8 lug, if so would that be difficult?

    high
     
  2. Esteban86K5

    Esteban86K5 1/2 ton status

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    I had asked this same quetion a few weeks ago.

    As far a the 14 bolt, there aren't any mods that you have to do to install it. As long as you get the same style backing plates as your 10 bolts so the e-brake cable can just be switched over, and you get an axle from a 3/4 ton and not a 1 ton(1 ton spring perches and shock mounts are different) you will be able to bolt it right in.

    As far as the front 10 bolt (I have one too) this is what "THATK30GUY" told me:

    GM has two different types of axles: the "first design" and the "second design". For those who dont know the difference, the "first" goes from 73-76. The "second" goes from 77 to 91. Some differences are:

    1. Backing plates are ALL diffferent. Both 1/2 and 3/4 ton for both designs are NOT the same thing. 3/4 tons are larger diameter than the 1/2 tons. There are currently 6 different types of backing plates. The 1/2 ton has the 73-76, 77-80, and 81-91. 3/4 ton is the same years, but only bigger around.

    2. Bearing hub and rotors are different. There are 4 types. 73-76 use a smaller wheel bearing on both the 1/2 and 3/4 ton. The 1/2 ton bearing hub is an internal drive. 3/4 tons were available in both the internal and external drives. 77 and newer bearing hubs are the same size wheel bearing. 1/2 and 3/4 tons are all internal drives. The differences in the rotor diameter is the fact that the 3/4 tons are larger around than the 1/2 tons. This is why the backing plates are larger around than the 1/2 tons. If you use a 1/2 ton backing plate on a 3/4 ton rotor, the caliper will NOT even align up with the bolts. If the 1/2 ton rotor is used with the 3/4 ton backing plates, the caliper will NOT have enough pad contact with the rotor.

    3. Spindles. 73-76 are one type only. They are "first design" small bearings. 1/2 and 3/4 ton spindles are interchangable. 77-91 spindles are "second design" and all interchangable between 1/2 and 3/4 tons. You cannot use a first design spindle with a second design bearing hub & rotor. The hub will wobble in place. If the second design spindle is used with a first design bearing hub, the hub will not even go on at all.

    4. D44 and 10B axle shafts are not interchangable. The D44 shafts measure: right - 36.13"
    left - 18.31"
    10B shafts measure: right - 35.46"
    left - 19.15"

    5. Steering knuckles. D44's have the infamous "flat top" knuckles on the passenger side. These are good for the crossover steering for where the steering arm is mounted on top of the knuckle after machine work and drilling has been done. The 10B knuckles have NO flat surface whatsoever. Machine work would be excessive to make the crossover work and therefore would be easier and cheaper to locate the correct knuckle off a D44.

    All in all, when doing a swap like this, try to round up the parts off one truck to use on the other. Such parts to swap over would be: backing plates, spindles, bearing hub & rotors, and if desired for crossover steering, the knuckles.

    The knuckles do NOT need to be changed if you do not plan on the crossover steering.

    It all boils down to this: D44 and 10B parts ARE interchangable from the knuckles out. Anything else from the knuckles in is NOT interchangable.


    ALL calipers on both D44 and 10B are compatible with either axle. Even the first and second design axles are compatible with BOTH 1/2 and 3/4 ton calipers. So, whatever swap you plan on doing, you can retain your stock calipers.
    When stepping up to the big D60, this is a whole different ball game. Nothing is interchangable from the D44 and 10B to the D60.

    I haven't done my front yet, but I've got all the parts already. My donor vehicle was an 82 3/4 ton burban. I took EVERYTHING from the backing plates out.

    Hope this answers all your questions.


    <font color=blue>Esteban</font color=blue>

    <font color=red>SEMPER FI TO MY BLAZER
     
  3. POWERMAD

    POWERMAD 1/2 ton status

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    Hey Bud
    That has got to be the best explaination I have seen yet.
    And as this seems to be a hot topic everyone is wanting info on this.
    Nice job.
    I think that because of CK5 all the available 3/4 and 1 ton axles are gonna vanish real quick. ;-)
    See ya

    my truck's not dirty, it's earth tone paint
     
  4. Esteban86K5

    Esteban86K5 1/2 ton status

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    I wish I could take credit for it but like I said That is what "THATK30GUY" answered to me on this very same question. He knows everything about these axles. If you have any questions he's the one to ask.

    <font color=blue>Esteban</font color=blue>

    <font color=red>SEMPER FI TO MY BLAZER
     
  5. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    A couple of things,

    Firstly the 10 bolt wasn't made til 77 or so and was phased in as the replacememnt for the front Dana 44. There were two versions of the 44, early and later. The later has the larger U-joints (297x) and internal hubs. Not all Dana 44's had flat top passenger knuckles...mine doesn't.

    As for the 14 bolt being a direct bolt in the 3/4 ton version is the closest you'll get. Mine was from a 3/4 ton and I still had to move the lower shock mounts. Also the driveshaft will require a hybrid U-joint to go from the 1310 half ton stuff to the 1350 3/4 ton yoke on the 14 bolt.

    Other than that everything looks good.

    Rene

    <font color=green>Dyslexics of the world...UNTIE!</font color=green>

    <P ID="edit"><FONT SIZE=-1>Edited by tRustyK5 on 06/10/01 01:49 PM (server time).</FONT></P>
     
  6. BlazerGuy

    BlazerGuy 3/4 ton status

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    Check out Waxer's article:
    <A target="_blank" HREF=http://www.coloradok5.com/8lugconversion.shtml>http://www.coloradok5.com/8lugconversion.shtml</A>

    Murphy's Laws on Life :
    "The longer you wait in line, the greater the liklihood that you are standing in the wrong line." [​IMG]
     

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