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14bsf to 14bff driveshaft ? **NEW u-bolt ?**

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by JIMs70K25, Nov 17, 2005.

  1. JIMs70K25

    JIMs70K25 1/2 ton status

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    Going to purchase a 14BFF to replace the 14BSF in my burb, How much shorter will my driveshaft need to be? or How much lift should I go with to use the stock driveshaft?

    I'm going to get the 14BFF this weekend, next question and I beleive I know the answer, Will my u-bolts/plate work? I believe it will not and I'll need new u-bolts and spring plates. confirm this please.
     
    Last edited: Nov 24, 2005
  2. mechted

    mechted 1 ton status Premium Member

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    IIRC, it might be something on the order of 1-2" or so shorter for the 14bff
     
  3. ratzila

    ratzila 1/2 ton status

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    When I went to the 14ff from the 14sf I used the same driveshaft with no mods. They have the same 1350 yokes
     
  4. smokkey1

    smokkey1 1/2 ton status

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    same here.
     
  5. JIMs70K25

    JIMs70K25 1/2 ton status

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    I thought the pinion stuck out further on the ff. Oh well, one less thing to worry about.
     
  6. dyeager535

    dyeager535 1 ton status Premium Member

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    Pinion yoke is about 1" further forward on the 14SF than 10 bolt, sounds like the 14FF and SF are about the same in that regard, makes sense.
     
  7. JIMs70K25

    JIMs70K25 1/2 ton status

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    TTT for new question in original post. Thanks!
     
  8. mechted

    mechted 1 ton status Premium Member

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    axle tube diameter is 3-3/8" on a FF, but you should get new ubolts regardless, once they have been torqued, they will not hold again, and can loosen up over time :eek1:
     
  9. dyeager535

    dyeager535 1 ton status Premium Member

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    Yes the u-bolts will work, same tube diameter.

    I've re-used the u-bolts for the couple of axles I've installed in my truck, whenever I'm doing maintenance those are one of the things I check, they've never loosened up on me. I made sure to keep the factory nuts and washer that is installed, they seem to have a different color about them for some reason...
     
  10. JIMs70K25

    JIMs70K25 1/2 ton status

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    Thanks!
     

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