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14bolt swap driveline?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by sasquatchhunter, Jul 17, 2003.

  1. sasquatchhunter

    sasquatchhunter Newbie

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    I have a 1976 k5 with a 12 bolt rear end and I was going to switch it over to a 14 bolt. I was wondering if I could get a way with not replacing the drive line right now? Is it a must or can a drive it around with the old 12 bolt one? My friend said I would but he wasn't totally sure

    /forums/images/graemlins/k5.gif
     
  2. azblazor

    azblazor 1/2 ton status Premium Member

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    The old drive line will work fine, just but a conversion ujoint. You can get them at pretty much any auto parts place. Do a search - the part number has been put up many times in the forums - I just don't have it.
     
  3. BlazerGuy

    BlazerGuy 3/4 ton status

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    You need Napa PN 348 it's a 1310-1350 combo joint used when swappin' in a 14 for 12...
     
  4. Beast388

    Beast388 1/2 ton status

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    12B to 14BFF conversion U-joint....Napa P/N 348 /forums/images/graemlins/thumb.gif
     
  5. Blue85

    Blue85 Troll Premium Member

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    Just keep in mind that the 14b pinion sticks forward further. This will make the driveshaft seem shorter. If you are lifted with a stock driveshaft, this is actually a good thing.
     
  6. Thumper

    Thumper 1/2 ton status

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    [ QUOTE ]
    Just keep in mind that the 14b pinion sticks forward further.

    [/ QUOTE ]
    Actually, it doesnt. They are the same. At least on my 14B and 12B. /forums/images/graemlins/smile.gif

    Mike
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    [​IMG]
     
  7. BowtieRed

    BowtieRed 1/2 ton status Author

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    yes, it stick out much farther, which explains my driveshaft having to be shortened 3" during the swap. idk what you are talking about thumper, sorry. i had a 12b too.
     
  8. nofeartruckin00

    nofeartruckin00 1/2 ton status

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    There must be a definite answer for this somwhere as to pinion length differences. But going from a '91 10 bolt to a '73 14 bolt, the pinion lenghts were dead on. No driveshaft mods for me. /forums/images/graemlins/thinking.gif
     

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