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How to tell the difference in a 14bff & 14bsf

Discussion in 'The Garage' started by franco802, Dec 23, 2006.

  1. franco802

    franco802 1/2 ton status

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    I might go to the wrecking yard today to look for a 14bff. How the heck can I tell if its a ff or sf?? Any pics I can see, so I don't fug up and get an sf:confused:

    Also, to bolt it right in to my K5, should I try to find one from a 3/4 ton?
     
  2. GMCJason

    GMCJason 1/2 ton status

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    Here, check this out. It should help.

    http://coloradok5.com/axleguide.shtml

    It's pretty easy to tell the difference once you see the two.

    And yes, the 3/4 ton is preferable so you don't have to move the spring perches.
     
  3. GMCJason

    GMCJason 1/2 ton status

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    I just read the ID chart descriptions and maybe a little more info is in order. The "small" 14 bolt with the 9 1/2" ring gear is the semi-floating version. The one you want is the big guy with the 10 1/2" ring gear. It's the one with the sort of diamond shaped housing.
     
  4. cbbr

    cbbr 1 ton status GMOTM Winner

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    This is a 14bff hub -

    [​IMG]

    This is a good read on 14 bolts.
     
  5. franco802

    franco802 1/2 ton status

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    Now what if i find one on a newer truck? Say.....88-94 3/4 pick up? Would it still bolt up with no problems? Brake lines will hook up fine?
     
  6. dremu

    dremu Officious Thread Derailer Premium Member

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    Spring perches will be WAY different on the IFS trucks. Stick with 73-88/91.

    -- A
     
  7. Steve GMC

    Steve GMC 1/2 ton status

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    14ff has this hub
    [​IMG]
     
  8. franco802

    franco802 1/2 ton status

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    Awsome!! Thanks!
    I been working on cars and have been racing since I was a kid. I always wondered what the bolts in the center of those big rear ends were for:o
     
  9. Steve GMC

    Steve GMC 1/2 ton status

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    yup.

    no prob
     
  10. CDA 455

    CDA 455 3/4 ton status

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    Is there a 3/4 ton 14bolt FF, and a 1 ton 14bolt FF :confused: :dunno: ? If there is, what is the difference?
     
  11. dremu

    dremu Officious Thread Derailer Premium Member

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    Spring perch width, and/or shock mounting. 1-ton's have the narrower frames and may have weird shock mounts (particularly 2WD, IIRC.)

    Also, some 1-tons are DRW; most would be D70's, but post-87's could be a wiiiide 14BFF, and the C&C DRW's are the same axle (just with different brakes and hubs) as an SRW.

    Your best bet for a drop-in into a Blazer is a K20 14BFF, i.e. 3/4, 4WD. Anything else, you may have some cutting & welding to do.

    Oh, fark ... just saw that you have a first-gen Blazer. I don't know if 73+ axles drop into your frame or not.

    -- A
     
  12. franco802

    franco802 1/2 ton status

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    Actually its a 2nd gen. I thought 1st gen was 60's-72?
    I have an 86'.
     
  13. CDA 455

    CDA 455 3/4 ton status

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    When I bought my 1st Gen., it already had a 14 bolt FF under it. I was just wondering if I had a 3/4 ton or 1 ton 14 bolt FF.

    Thanks for the info!
     
  14. sandawgk5

    sandawgk5 3/4 ton status

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    You can put a new style 14FF in your rig you just have to change the spring perches. Also some of the later ones came with Disc brakes with the Ebrake being the drum in hat style. They are also wider than the 73-87 14FF.

    Ira
     
  15. franco802

    franco802 1/2 ton status

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    I am going to try and find one from a 73-87.
     
  16. dremu

    dremu Officious Thread Derailer Premium Member

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    69-72. I think I confused you with the OP :)

    And I call yours a gen-4 (69-72, 73-75, 76-80, 81-86, 87-91) but that's just me =))

    -- A
     

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