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Anyone delt with the 6 lug front 8 lug back thing?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by StonerK5, Feb 14, 2002.

  1. StonerK5

    StonerK5 1/2 ton status

    Feb 13, 2002
    Likes Received:
    Phoenix Arizona
    Looking at replaceing the rear (broken 10b) with a 14FF, but don't have the time or money for the front just yet. Beside having to carry 2 spares, is there anything else I should look out for?

    "What ever happened to my Rock N Roll?"
  2. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

    Jul 23, 2000
    Likes Received:
    E-town baby!
    All you need for 8 lug front is the outers, unless the 14 bolt's gear ratio doesn't match. Then you have more issues to deal with than keeping two spares.


    <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. DuneRunner

    DuneRunner 1/2 ton status

    Aug 1, 2001
    Likes Received:
    Fremont CA
    Rusty are the parts for the conversion excessable at a junck yard?(certian truck or van to get parts) Or is it something that we need to buy from a parts store? I know others are always selling them on the boards...Just wondering where the source is?


    Later <font color=green>KEN</font color=green>
    Fremont, CA
    DANGIT it's not a bronco!
    <a target="_blank" href=http://community.webshots.com/user/kensk5>My Picts</a>
  4. Greg72

    Greg72 "Might As Well..." Staff Member Super Moderator

    Mar 5, 2001
    Likes Received:
    698 Days to BB2018
    As far as doing the swap, you will also need to verify/modify:

    Spring pad widths
    Pinion angle needs to be set....usually when you are re-welding spring perches....or maybe with shims.
    Shock mounts on 14BFF
    Overall length of 14 Bolt pinion is longer, so you might need to shorten rear driveshaft
    U-Joint is different, so you need to buy a "combination u-joint" to adapt the driveshaft to it.

    Most of the early style axles use square U-Bolts that install "top-down"...the 14-Bolt typically uses a rounded U-Bolt that installs "bottom up"....so you'll need the U-Bolts and the proper set of top plates to secure them.

    For convenience, you can buy a complete set of used 8-Lug conversion parts for the front axle.....if you're lucky you can find them for around $200. Not an immediate requirement if you're willing to carry two spares...but it saves you from having to buy the D60 right away!!!


    '72 K5 Blazer - 427BB/TH350/NP205/6" Lift/35x12.50's
    <font color=blue>See it here: </font color=blue><a target="_blank" href=http://coloradok5.com/gallery/albun38>http://coloradok5.com/gallery/albun38</a>

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