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more debate, which u-joint for 14B

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by solowookie, Jun 5, 2001.

  1. solowookie

    solowookie 1/2 ton status

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    OK, there seems to be some issues on which u-bolt works when connecting a stock drive line to a 14B FF. The 2 napa part numbers are # 348 and # 447.

    The #447 was the u-joint my conversion used.

    The 2 axles came off the same truck, and the year I've been using to get parts for the front axle is a 76 3/4 ton.

    What is the possiblity this is related to the year of the 14B? Wes??? If I remember correctly BlazzinOR used the # 348 u-joint.

    [​IMG] <font color=blue> Jeff </font color=blue> [​IMG]
     
  2. Bigd

    Bigd 1/2 ton status

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    I thinkthe 14 bolt side is the same.THe other side is either a 1310 size older blazers with circlips on the outside thats what i had too use on my 76.My friends 82 has 1310 size joint but it had circle clips in the inside.I think i had too use 447 and he used the 348.
     
  3. BurbinOR

    BurbinOR 3/4 ton status

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    Jeff, you are correct, mine was definitely the #348. The #447 was equal sized on both ends from my recollection and would not have worked for me. My 1/2 ton '79 K5 driveshaft uses the snap style clips to hold in the 'small side' u joint if that helps.

    <font color=blue>'79 ONE TON TPI K5 - See it at---&gt;<A target="_blank" HREF=http://www.blazzinor.coloradok5.com>http://www.blazzinor.coloradok5.com</A>
     
  4. solowookie

    solowookie 1/2 ton status

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    I'm hoping this will give those getting the parts in the future a heads up... When I did the lift I bought both, and will return the one I didn't use.

    [​IMG] <font color=blue> Jeff </font color=blue> [​IMG]
     
  5. Boss

    Boss 1/2 ton status Author

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    Well, here is the difference between the two.
    I think atleast!

    The older K5 used the 1310 size ujoints at the rear drive shafts).
    the newer ones (I would say mid 80s and up used the 1330 size ujoints at the rear drive shaft.
    Part # 447 (Napa) will work with the 1330/1350 combo.
    The 348 will work with the 1310/1350 combo.

    I had the 1310/1350 Ujoint combo at first, and the 1310 side was too small for my stock driveshaft. Hope this clears up all the confusion.
    Boss
    ps, all fronts- Dana44, 10bolt and Dana 60 uses the 1310 size Ujoints no matter what year.

    <A target="_blank" HREF=http://www.boss.coloradok5.com>http://www.boss.coloradok5.com</A>
     
  6. solowookie

    solowookie 1/2 ton status

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    hey Boss, thanks for clarifying this...

    [​IMG] <font color=blue> Jeff </font color=blue> [​IMG]
     
  7. 6.2Blazer

    6.2Blazer 1/2 ton status

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    The #447 joint (1350/1330 combo) worked when I did the conversion on my '90 K5.
     
  8. Zepplin

    Zepplin 1/2 ton status

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    On my 74 Blazer I used the 348. I just did it less than a month ago.

    74 Blazer
    Zepplin
    Current pictures of my Blazer: <A target="_blank" HREF=http://www.jeremyb.coloradok5.com/photo.html>http://www.jeremyb.coloradok5.com/photo.html</A>
     

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