Dismiss Notice

Welcome To CK5!

Registering is free and easy! Hope to see you on the forums soon.

Score a FREE t-shirt and membership sticker when you sign up for a Premium Membership and choose the recurring plan.

14bFF or 14bSF - How to tell externally?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by BorregoK5, Sep 29, 2001.

  1. BorregoK5

    BorregoK5 1/2 ton status

    Joined:
    Sep 7, 2001
    Posts:
    2,457
    Likes Received:
    0
    Location:
    San Marcos, Ca USA
    I just got back from my local junk yard where I found a whole bunch of Corporate 14 bolt axles under mostly k15 and k30 trucks. How do you tell the difference between the Semi-Floating and the Full-Floating axle? The only difference I noticed between them was the distance the hub protruded from the drum, some were about 2 inches in length longer. If there is a sure fire way to tell the difference externally, then I'm going back tomorrow to go get it. Anyone???

    What about spline differences on the 14bFF, any way of telling externally, or will I have to pop the diff cover?? Are there differences?

    Help a fellow off-roader get his rig up to spec, would ya.
    (Unfortunately not a single Dana60 front though, have to drop some cash on that for a rebuilt)

    What, Me Worry?
    <a target="_blank" href=http://www.echobit.com:81/k5/> The 'BEFORE' pictures</a>
     
  2. muddin4fun

    muddin4fun 3/4 ton status

    Joined:
    Feb 19, 2001
    Posts:
    5,644
    Likes Received:
    0
    Location:
    N Texas
    The hub sticking out means it's a full floater [​IMG].

    I think you might have to pop the cover to tell a difference in the spline..

    <font color=blue>Women should put pictures of missing men on beer cans...</font color=blue>
    Website link is in my profile [​IMG]
     
  3. Pure Insanity

    Pure Insanity 1/2 ton status

    Joined:
    Mar 17, 2001
    Posts:
    4,579
    Likes Received:
    0
    Location:
    Dade City, Florida
    FF has a big hub on it, kinda like looking at a front hub.

    SF has no hub, like a car rear end.

    If ya can't stop.......Smile as you go under! [​IMG]
     
  4. chevrules

    chevrules 1/2 ton status

    Joined:
    Aug 26, 2001
    Posts:
    127
    Likes Received:
    0
    Location:
    Canada
    Surefire way is to look at the pinion side of the diff.The FF pinion housing bolts in.Also the FF has bolts that hold the axle in externally.The SF has no external hub.

    chevrules...always has and always will
     
  5. Pugsley

    Pugsley 1/2 ton status

    Joined:
    Jan 16, 2001
    Posts:
    3,556
    Likes Received:
    0
    Location:
    Tucson, Arizona
    On this note - is anyone an expert in dually rears? Mine has studs instead of bolts holding the shafts in - was this normal on 87's or is it something added by the former owner?

    Of the 5 toughest dogs in the neighborhood, my cat's ranked #3
    <a target="_blank" href=http://pugsley.alloffroad.com>pugsley.alloffroad.com</a>
     
  6. BorregoK5

    BorregoK5 1/2 ton status

    Joined:
    Sep 7, 2001
    Posts:
    2,457
    Likes Received:
    0
    Location:
    San Marcos, Ca USA
    Thanks to everyone for the quick posts and the knowledge transfer, I saw quite a few of the Full-Floaters then. Anyone have any ideas on the spline possibilites, I've got a few to choose from, so I want to get the best one?

    What, Me Worry?
    <a target="_blank" href=http://www.echobit.com:81/k5/> The 'BEFORE' pictures</a>
     
  7. chevrules

    chevrules 1/2 ton status

    Joined:
    Aug 26, 2001
    Posts:
    127
    Likes Received:
    0
    Location:
    Canada
    The only FF rear I have ever seen with studs was on the Dodge 3/4 and 1 tons.It is possible that it could have been changed though.

    chevrules...always has and always will
     
  8. Pure Insanity

    Pure Insanity 1/2 ton status

    Joined:
    Mar 17, 2001
    Posts:
    4,579
    Likes Received:
    0
    Location:
    Dade City, Florida
    Splines Im not sure of but make sure you look at the pinion to make sure you are getting a 14. A D60 looks pretty similar to someone that doesnt know the difference. You mentioned the length of the hubs on them, a 60 has a longer hub than a 14. Best bet is like what Chevyrules said to look for the bolts around the pinion support.

    If ya can't stop.......Smile as you go under! [​IMG]
     
  9. chevrules

    chevrules 1/2 ton status

    Joined:
    Aug 26, 2001
    Posts:
    127
    Likes Received:
    0
    Location:
    Canada
    The FF has 30 spline axles.

    chevrules...always has and always will
     
  10. Pugsley

    Pugsley 1/2 ton status

    Joined:
    Jan 16, 2001
    Posts:
    3,556
    Likes Received:
    0
    Location:
    Tucson, Arizona
    I figured it was done at some point throughout this thing's history - the previous owner told me that the rear end was rebuilt in 95, so that's probably when the studs showed up.

    Of the 5 toughest dogs in the neighborhood, my cat's ranked #3
    <a target="_blank" href=http://pugsley.alloffroad.com>pugsley.alloffroad.com</a>
     
  11. BorregoK5

    BorregoK5 1/2 ton status

    Joined:
    Sep 7, 2001
    Posts:
    2,457
    Likes Received:
    0
    Location:
    San Marcos, Ca USA
    Thanks to ColoradoK5, I printed out the <a target="_blank" href=http://coloradok5.com/axleguide.shtml> Axle Identification Chart</a> and took it with me. Makes it a snap to identify each of the axle types. We should get the FF and SF stuff on there too!


    What, Me Worry?
    <a target="_blank" href=http://www.echobit.com:81/k5/> The 'BEFORE' pictures</a>
     
  12. Pure Insanity

    Pure Insanity 1/2 ton status

    Joined:
    Mar 17, 2001
    Posts:
    4,579
    Likes Received:
    0
    Location:
    Dade City, Florida
    FF and SF is on there. Unless I read your post wrong.[​IMG]

    If ya can't stop.......Smile as you go under! [​IMG]
     
  13. BorregoK5

    BorregoK5 1/2 ton status

    Joined:
    Sep 7, 2001
    Posts:
    2,457
    Likes Received:
    0
    Location:
    San Marcos, Ca USA
    I think we're both right, if I read into whats been said here, then the "Small' 14 bolt is the Semi-Floating. It just doesn't say Semi-floating or Full-Floating on the chart, or that interesting tid-bit on the pinion housing bolts on a 14bFF!

    Thanks for the Spline info chevrules!

    What, Me Worry?
    <a target="_blank" href=http://www.echobit.com:81/k5/> The 'BEFORE' pictures</a>
     
  14. Pure Insanity

    Pure Insanity 1/2 ton status

    Joined:
    Mar 17, 2001
    Posts:
    4,579
    Likes Received:
    0
    Location:
    Dade City, Florida
    Oh yeah it doesnt specify FF or SF. [​IMG] The pinion support makes it fool proof. Unless you are looking at a 9" ford. That is the only other differential that I can think of that has a removable pinion.

    If ya can't stop.......Smile as you go under! [​IMG]
     
  15. chevrules

    chevrules 1/2 ton status

    Joined:
    Aug 26, 2001
    Posts:
    127
    Likes Received:
    0
    Location:
    Canada
    no prob,we are here to help each other....oh by the way,did I mention that Chevrules

    chevrules...always has and always will
     
  16. Pugsley

    Pugsley 1/2 ton status

    Joined:
    Jan 16, 2001
    Posts:
    3,556
    Likes Received:
    0
    Location:
    Tucson, Arizona
    Way old GM's had an Eaton rear that worked like a Ford 9" with a removable carrier, and a removable cover. From around 72 back on the one tons.

    Of the 5 toughest dogs in the neighborhood, my cat's ranked #3
    <a target="_blank" href=http://pugsley.alloffroad.com>pugsley.alloffroad.com</a>
     
  17. chevrules

    chevrules 1/2 ton status

    Joined:
    Aug 26, 2001
    Posts:
    127
    Likes Received:
    0
    Location:
    Canada
    They also put a Detriot locker in that early rear.I had 2 but sold them. :((

    chevrules...always has and always will
     
  18. Pure Insanity

    Pure Insanity 1/2 ton status

    Joined:
    Mar 17, 2001
    Posts:
    4,579
    Likes Received:
    0
    Location:
    Dade City, Florida
    I always forget the old Eaton rears! They do resemble a 9 quite a bit.

    If ya can't stop.......Smile as you go under! [​IMG]
     
  19. 84_Chevy_K10

    84_Chevy_K10 Banned

    Joined:
    May 30, 2001
    Posts:
    17,669
    Likes Received:
    0
    Location:
    IL, USA
    Toyota rears are much like the Ford 9" too.

    A dually would have a Dana 70, not a 14 FF. Maybe many of you know this, but I didn't see it mentioned.

    Tim
    '84 Chevy K10, lifted, loud, fast, and 3/4 ton axles
     
  20. Pugsley

    Pugsley 1/2 ton status

    Joined:
    Jan 16, 2001
    Posts:
    3,556
    Likes Received:
    0
    Location:
    Tucson, Arizona
    Depends on the year of the dually - both 14FF's and D70's showed up in duallys over the years, with the D70 being more common.

    Of the 5 toughest dogs in the neighborhood, my cat's ranked #3
    <a target="_blank" href=http://pugsley.alloffroad.com>pugsley.alloffroad.com</a>
     

Share This Page