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14bff, 14bsf or 12 bolt?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by emoo99, May 7, 2003.

  1. emoo99

    emoo99 1/2 ton status

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    ok i'm running some 10 bolts with 3.08's now, i want to upgrade axles because it's cheaper than a regear, i really want to keep my 6 lug rims and i do not see any need for a 14bff as of now because" 1.not doin any major wheeling 2.biggest tire i'm goin with this truck is 35's 3.really low clearance and it's heavy.. BUT i really like to romp on the gas and it would tear 4.56 gears up in a 10bolt, so my question is will a 12bolt be bettor for me when it comes to ring and pinion contact? or is a 14bsf even better? i don't want to shred my gears up but i want to be able to race someone off the line and i know with a 14bff i can weld the spiders and dump on the gas withoout worrying at all.. I have about $600 to spend at the junkyard, what should i look for 14bsf(6 lug), or 12bolt? i don't really need "stonger" axles just something that the gears will withstand my lead foot /forums/images/graemlins/grin.gif. any suggestions? also what truck can i pull the axle from i'm goin axle shopping in a few weeks..
     
  2. Sandman

    Sandman 3/4 ton status Author

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    Are you running an auto? Auto's are pretty forgiving on stuff. I think you could get away with the 12 bolt rear. I did for years and didnt have problems.
     
  3. emoo99

    emoo99 1/2 ton status

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    yea.. running auto with 700r4..anyone else?
     
  4. mudhog

    mudhog THEGAME Staff Member Super Moderator

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    after blowing up my 12 bolt twice with 33's I'm not a big fan of them if you need to stay 6 lug go with a 14sf /forums/images/graemlins/thumb.gif
     
  5. emoo99

    emoo99 1/2 ton status

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    do you think i'll have much clearance with my 33's if i went 14bff and just did some 8-6lug conversions? are the 14ff's the same strength as the 14sf's? only that if you break an axle you can drive home with a ff right?
     
  6. TONYP

    TONYP 1/2 ton status

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    get the 14FF (around $200.00) re-gear the front and then get a set of these to keep your 6 lug rims...

    8 to 6 rings



    [​IMG]
     
  7. mudhog

    mudhog THEGAME Staff Member Super Moderator

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    a 14ff is stronger than a 14sf and yes if you break an axle you can still drive a 14ff home /forums/images/graemlins/thumb.gif
     
  8. emoo99

    emoo99 1/2 ton status

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    [ QUOTE ]
    get the 14FF (around $200.00) re-gear the front and then get a set of these to keep your 6 lug rims...

    [/ QUOTE ]
    couldn't i just pull the front end off the same truck i'm pulling the rear end off of? instead of regearing my front? and i should look for a 77-87 K30 for these right? they basically look like the older silverado's huh? i don't remember what k30's look like?
     
  9. mudhog

    mudhog THEGAME Staff Member Super Moderator

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    [ QUOTE ]
    and i should look for a 77-87 K30 for these right?

    [/ QUOTE ]
    if you are looking for a k30 it will be a dana 60 front /forums/images/graemlins/thumb.gif
     
  10. Bhintz

    Bhintz 1/2 ton status

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    look at the k20 instead because its a direct bolt in w/ a k30 you have to move the shock mounts and reweld the spring perchs.
     
  11. emoo99

    emoo99 1/2 ton status

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    cool do the k20's have dana 60's in them also?
     
  12. 83PJW

    83PJW 1/2 ton status

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    no dana 44 basicly a 10 bolt with 8 lugs.
     
  13. BlazerGuy

    BlazerGuy 3/4 ton status

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    I doubt very seriously that you would break anything with a stock 350 unless you just do brake stands in 4-lo(hubs unlocked of course /forums/images/graemlins/wink.gif). Are you planning on a nitrous injected big-block or something?
     
  14. emoo99

    emoo99 1/2 ton status

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    [ QUOTE ]
    I doubt very seriously that you would break anything with a stock 350 unless you just do brake stands in 4-lo(hubs unlocked of course /forums/images/graemlins/wink.gif). Are you planning on a nitrous injected big-block or something?

    [/ QUOTE ]
    no i'm not doin anything like that, and no i don't plan on nitrous or making 14 second quarter miles any time soon, i just heard that 4.56 gears in a 10 bolt can be "skeptical" if you rom on the gas alot, i'm just trin to figure out what axles i want then figure if i want some 4.10
    sd or 4.56,, 4.10's are soo much more common i might just go with those from a 12 bolt..
     
  15. 84_Chevy_K10

    84_Chevy_K10 Banned

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    The general consensus here is that a 12 bolt is much stronger than a 10 bolt which is simply untrue. The pinion bearings are smaller in the 12 bolt than the 10 bolt! Sure, you get 30 spline axles instead of 28, and they're a little bigger, but that's about it.

    Just ditch your rims, go 8 lug, and get the 14 ff/ 10 bolt or D44 combo. You'll be much happier. Trust me.
     
  16. emoo99

    emoo99 1/2 ton status

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    cool, i think i'm goin to the nearest junkyard and look for a K20 to pull from, if i get a 14bff and a dana 60 from it how much would i spend? what truck can i use as a donor for a Dana 44 if the Dana 60 cost too much?
     
  17. Fubeca

    Fubeca 1/2 ton status

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    The local junk yard around here wants $250 each for the 14B and the D44. Most D60s I've seen are between $450 and $3000 -- depending on its condition. You won't find one in a K20 though, they only came in K30s -- Good Luck /forums/images/graemlins/smile.gif
     
  18. emoo99

    emoo99 1/2 ton status

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    right on,, i have about $600 to spend.. so from a K20 between 77-87 i can pull a Dana 44 and 14bff with what gears.. 4.10's? and the axles will be a bolt-in fit? thanks guys for all your help i'll let ya know what i get.. i'm goin in a week or two to go look.
     
  19. 84_Chevy_K10

    84_Chevy_K10 Banned

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    Any K20 from 73-87 will have what you want. About '79 or so, they'll start to have 10 bolt fronts, which are just as strong as the Dana 44 anyway. 81 and older will have the 14 bolt full floater. For $600, you should be able to not only get the axles you want, but 8 lug rims and brakes too. I wouldn't pay more than $250 for both axles as pulled from a junkyard truck.
     
  20. emoo99

    emoo99 1/2 ton status

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    do 4.10's and 4.56's come in those trucks? dang i forgot about brakes, i jsut dropped like $400 on new brakes on my 10 bolts.. /forums/images/graemlins/frown.gif
     

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