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How common 4.56 gears in a 14ff?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by K5er4Life, Feb 15, 2003.

  1. K5er4Life

    K5er4Life 1/2 ton status

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    So? the most common I seem to be finding is 3.73, I want to know if I should just bite the bullet and buy the 14ff and regear it to 4.56 b/c I ccant seem to find any 4.56
     
  2. TOMER

    TOMER Registered Member

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    Mine is from a 91 K30.
     
  3. k20

    k20 3/4 ton status

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    4.56 werent factory as far as i know, probably the most common would be 4.10. To find a 4.56 in a 14FF will be hard in all likelyhood as someone who has re-geared it has put on bigger tires, so he needs the strength so he probably wont be selling it. So i would say your probably gonna be re-gearing whatever you get.
     
  4. bigjbear

    bigjbear 1 ton status Staff Member Moderator

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    They are in M1008s-mil surplus.
     
  5. crazyrc

    crazyrc 1/2 ton status

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    My 14B came with 4.56. Suposedly came out of a 85 1 ton.
     
  6. dleroy43

    dleroy43 1/2 ton status GMOTM Winner

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    My 4.56s came out of a cucv with a detroit /forums/images/graemlins/burb.gif
     
  7. Sparky87k5

    Sparky87k5 1/2 ton status

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    100% of all military 1 1/4 ton trucks I've found had 4.56's. Most private owned are 4.10's and a few 3.73's.
    My 4.56s came out of a cucv also and with a detroit locker.
     
  8. R72K5

    R72K5 Banned

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    anyone got a resto pack/gm specs sheet pack for any 73-80 3/4 or 1 ton trucks ? im curious to see what std equipment ratio was in these years, before 73 it was always 4.57 eaton or 4.56 dana
     
  9. tarussell

    tarussell 1/2 ton status

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    I don't have the specs ( option codes ) but I drove a company truck years ago that came with 4.56's from the factory - It was a 1978 K-20 / 292 / 465-205 / D44-14FF.A friend of mine bought a 1979 Cab Chassis K-30 w/ 4.56's from the factory 350/465/205/D60/14FF.
    I owned a 1983 K-3500 GMC that had 4.56's from the factory ( but it was a HD Dana 70 rear ). My local Vol. Fire Dept. had a 1981 K-30 Crew Cab - Cab Chassis that had 4.56's from the factory 350/400/205 / D60-14FF w/ A Gov-Lock (junk).I have seen a few C-3500 1988 and up Dually's that came w/ 4.56's also .
     
  10. k20

    k20 3/4 ton status

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    hmnnn learn something new everyday.
     
  11. jekbrown

    jekbrown I am CK5 Premium Member GMOTM Winner Author

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    my ff14b, which I bought new-in-crate, was/is 4.56. That crate was green... like olive drab.... so I guess there is yet another example of the military-1.25t-rigs-have-4.56 gears. /forums/images/graemlins/laugh.gif

    j
     
  12. mountainexplorer

    mountainexplorer 1/2 ton status

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    I had a '77 Crew Cab 1-ton 4x4 (factory small block 400) with 4.56 gears in the 14 bolt and Dana 60.

    I just pulled a 14 bolt out of a '78 1-ton 2wd 6-cyl/4spd truck. Found out it originally had 4.56's according to the sticker in the glove box...but I got it home and pulled the cover, and found 4.10 gears /forums/images/graemlins/frown.gif . Date on the ring gear said 10 of '85, so someone must have put 4.10's in it around 1985.
     
  13. 4x4Freak

    4x4Freak 1/2 ton status

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    My 81 K30 has 4.56s in it. As far as I know it's all stock.
     
  14. Triaged

    Triaged 1/2 ton status

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    I got my set of 4.56 axles out of a 77 K20. They were factory. You can find them...you just might have to wate till you find them for the right price.
     
  15. K5er4Life

    K5er4Life 1/2 ton status

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    I know I can pick up a 14ff for about 150 bucks around where I live, they are a dime a dozen here. But the expensive part will be the regearing. Anyone thought about getting a diff shop to cut the ends of the axle tubes off and replacing them with the ends from a 10 bolt, that way you could use the 10 bolt drums with a 6 lug?
     
  16. bigjbear

    bigjbear 1 ton status Staff Member Moderator

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    ORU in CA will build you one for about $3000. /forums/images/graemlins/eek.gif www.offroadunlimited.com For those who keep old mags look in Petersen's 4W&OR May 2001, yellow '79 Ford on the cover. They take a FF14B cut the ends off and make it into a SF 6 lug, WTF!
     
  17. wfo163

    wfo163 1/2 ton status

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    My 14ff is from an 83 k30 and has 4.10. All the k30s at work (us navy) have 4.56 in them and there are a ton of those trucks in the bone yard as well. /forums/images/graemlins/truck.gif
     
  18. K5er4Life

    K5er4Life 1/2 ton status

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    Man screw that!!! I am trrying to take my friends offer who owns a differential shop and have him do it for me. He does many of the differentials for shops in our area. He will install a new 14ff w/a detriot out of a 2001 chevy truck, then torch the ends off and use my 6 lug drum and still be a full floater, and throwin some 4.56's under there for 1800 bucks. He can do it for me cheap b/c he already has the ff, deatriot, and gears.
     
  19. wfo163

    wfo163 1/2 ton status

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    That sounds awfully strange. I guess you could weld on a plate that allows you to bolt a 10-bolts drum to the tube but the 14's axle tube is so much larger than the 10 bolt that Im not sure that they will fit. Also how are you going to attach the drums to the full floating hub? That thing alone is almost the size of a 10 bolts entire rear brake system, and have a larger 8 lug pattern. Im sure your friend is a great fabricator but there seems to be to many size conflicts here.
     
  20. Triaged

    Triaged 1/2 ton status

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    $1800 is alot of $$$

    I bought both of my axles (3/4-ton D44 and 14FF) with 4.56's off of someone on this sight for $400

    Even if you count the money I spent for new 8-lug wheels I am still way under that cost (I payed $425 for 5 Eaton 15x10's with shipping).
     

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