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14 Bolt FF Swap

This is a discussion on 14 Bolt FF Swap within the Offroad forums, part of the General Discussion category; They said the hub diameter is 4.25, so I assume I am going to have to have the axles turned ...

  1. #21
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    Re: 14 Bolt FF Swap


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    They said the hub diameter is 4.25, so I assume I am going to have to have the axles turned down. I have seen that you have a problem with them leaking? I need to measure the stockers, I dont know what the diameter is where it bolts to the hub off hand. I got lucky in that my aftermarket wheels have a 4.25 in hole so they will clear.

  2. #22
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    Re: 14 Bolt FF Swap

    Yeah aftermarket wheels come in 4.25 center. The stock shafts are much larger than that. So you will need to turn the shafts down, or take the shafts out to take your wheels off. On my shafts i removed so much of the flange and you can't run washers on the bolts they leak terrible the shafts are actually warped.

    Still not sure how that is cheaper than a 14b sf but have fun with it. I know i wish i woulda went SF just FYI.
    Last edited by chevytaHOE5674; 06-30-2008 at 07:57 PM.
    2000 Tahoe Z71, 14bFF 6 lug, 241 swap, bumpers, sliders.
    1988 K5, 350/700R/241 locked 10B, welded 12B, 35's, half doors.

  3. #23
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    Re: 14 Bolt FF Swap

    The stock shafts are 4.5 inches, so I have to loose 1/4 of an inch. It is cheaper because I cant touch a 6 lug 14 bolt SF axle for less than $800, plus almost 600 for the disc brake conversion with e-brake, then the rebuild kit for the axle on top of that, and the locker is $400 more expensive. The 14 bolt FF was $50, plus the $1499 for the 6 lug conversion and that comes with new bearings and seals, and the locker is $329. It is cheaper by almost $400, and I end up with a stronger axle in the end.

  4. #24
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    Re: 14 Bolt FF Swap

    A thought about the problem with leaking, would it be possible to add additional thickness to the axle flange where it bolts to the hub in order to stiffen it and reduce the possibility of leaks when you shave the diameter down? Would welding additional material on here compromise the strength of the axle shafts from the heat? Might be a dumb questions

  5. #25
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    Re: 14 Bolt FF Swap

    I am going to try that exact thing when i get back to the shop. Plan to machine the shafts smooth and add a piece to the end to add some rigidity. Hopefully that stops it.
    2000 Tahoe Z71, 14bFF 6 lug, 241 swap, bumpers, sliders.
    1988 K5, 350/700R/241 locked 10B, welded 12B, 35's, half doors.

  6. #26
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    Re: 14 Bolt FF Swap

    wow i paid 75 bucks for my sf and did my rear disk with parking brakes for about 425



  7. #27
    Snap-On Whore LPG PWRD's Avatar
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    Re: 14 Bolt FF Swap

    Quote Originally Posted by chevy7398
    wow i paid 75 bucks for my sf and did my rear disk with parking brakes for about 425
    I demand more info now..
    Part descriptions and numbers!!!



























    Please
    DD: 2001 Silverado 1500 ECSB 5.3L

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  8. #28
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    Re: 14 Bolt FF Swap

    Elderado calipers?
    2000 Tahoe Z71, 14bFF 6 lug, 241 swap, bumpers, sliders.
    1988 K5, 350/700R/241 locked 10B, welded 12B, 35's, half doors.

  9. #29
    Registered User chevy7398's Avatar
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    Re: 14 Bolt FF Swap

    brand new calipers from TSM part number 3120, $320 (includes new pads, mounting pins, cable brackets and springs)
    rotors from advance auto $70 for both (73-87 k20 front rotors)
    caliper brackets $50 on ebay

    ok so it was $440, still way less then the 600 bucks he was taking about

  10. #30
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    Re: 14 Bolt FF Swap

    They look like the same parking brake design as the elderado calipers... If they truly are then i wouldn't give somebody 10 dollars for those suckers. i tried a set of them and after 3 weeks of adjustment, infinite searchs all saying they won't stay adjusted i scraped them and went to K1500 front calipers.
    2000 Tahoe Z71, 14bFF 6 lug, 241 swap, bumpers, sliders.
    1988 K5, 350/700R/241 locked 10B, welded 12B, 35's, half doors.

  11. #31
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    Re: 14 Bolt FF Swap

    I am going to reuse my 10 bolt disk brakes when I finally get around to rebuilding my 14 bolt. They will bolt up with the aid of a spacer. So aside from the spacer, my brakes should be free.

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    Re: 14 Bolt FF Swap

    Quote Originally Posted by FrostBite
    I am going to reuse my 10 bolt disk brakes when I finally get around to rebuilding my 14 bolt. They will bolt up with the aid of a spacer. So aside from the spacer, my brakes should be free.
    OE rear disc? if so what rotor would you run?
    DD: 2001 Silverado 1500 ECSB 5.3L

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  13. #33
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    Re: 14 Bolt FF Swap

    I have the factory disks on my 10 bolt. And my 14 bolt is the SF'er, not the FF'er so I'm not sure about it.

  14. #34
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    Re: 14 Bolt FF Swap

    That 14 bolt SF you got for $75 is 8 lug, I can get those here for around $200. I need a 6 lug axle, they charge a huge premium for it because it is getting rare to find around here. 6 lug is the issue here.
    Last edited by subman1980; 07-02-2008 at 07:41 AM.

  15. #35
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    Re: 14 Bolt FF Swap

    Quote Originally Posted by subman1980
    That 14 bolt SF you got for $75 is 8 lug, I can get those here for around $200. I need a 6 lug axle, they charge a huge premium for it because it is getting rare to find around here. 6 lug is the issue here.
    You can buy 6 lug axle shafts and then just swap them in.
    Last edited by FrostBite; 07-02-2008 at 08:06 AM.

  16. #36
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    Re: 14 Bolt FF Swap

    Yup, and that adds to the cost of the SF build up, and you end up with a weaker axle in the end. I tow a lot with this truck, and I have already grenaded the stock 10 bolt twice. I am done with fixing that thing. I figure if I am going to do it, I am going to do it once and do it right. In my opinion if we are only talking a small difference in price between a SF and a FF, Id rather have the FF.

  17. #37
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    Re: 14 Bolt FF Swap

    Okay, so I am getting the 14 bolt torn down today. My gears, locker, u-bolts, spring plates, axle perches, shock mounts, rebuild kit, 6 lug hubs and brake kit, and diff cover are all ordered. Is there anything else I should do to this axle while I have it torn down? I was wondering about welding the tubes solid to the housing or any other mods? Thanks!
    Last edited by subman1980; 07-07-2008 at 10:28 AM.

  18. #38
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    Re: 14 Bolt FF Swap

    While I was at welding on new perches, shock mounts, gears, brakes, ect. I decided to plug weld and weld my axle tubes all together. I preheated to about 500 degrees and then used a 6011 rod for good penetration. I have heard that the 14 bolt center section is made of a black iron that is best to use a nickle type to weld on with. If you need some pics let me know.

  19. #39
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    Re: 14 Bolt FF Swap

    The 14 bolt housing is grey iron, different from Dana nodular iron castings. It has a ton of excess carbon floating in the iron so you need nickel to bond to it to prevent it from making the weld brittle in an ideal environment.

    Best process: Weld the tube and centersection together with a heavy preheat, nickel rod, solid peening, post heat and then wrap it in an insulator. Let it cool slowly. Once cool, grind out the root of the nickel weld, leaving the very base (do not grind back into the parent metals) and reweld with mild steel and increase the throat from what you did with nickel, peen, post heat, wrap and slow cool.

    You can weld it with mild steel filler from the outset, though I've seen plenty of brackets snap right off grey iron like they were hot glued on. I would use a truss if you just plan to use mild steel filler and then want to beat on it and not spin a tube ever.
    Last edited by bggrnchvy; 07-07-2008 at 08:10 PM.


    1997 K1500 ECSB LQ9/80e/241/D60f/C14FF
    2006 Dodge 2500 610CTD/G56/271/AAM9.25/AAM11.5

  20. #40
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    Re: 14 Bolt FF Swap

    Quote Originally Posted by subman1980
    The stock shafts are 4.5 inches, so I have to loose 1/4 of an inch.
    thats only .125" off the entire OD of the shaft. if your wheels are a true 4.25" (most are larger than advertised) you're going to have to take more off or you'll end up with a press fit wheel, which isnt a good idea when it comes time to remove them.
    77 Chevy K20 - 80 GMC K2500 (in pieces)
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