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Need Help rear end !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Monster, Aug 9, 2003.

  1. Monster

    Monster Registered Member

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    I have a 86 K5 Blazer. my 10 bolt rearend blew up which had 4.56 gears in it to turn my 35 inch tires.

    I have a 700-R4 tranny. My question is what rear end can I put in there that is stronger than a ten bolt. What type of truck should i get the rear end from and what year also what needs to be changed. /forums/images/graemlins/angryfire.gif
     
  2. o2bjimmy

    o2bjimmy 1/2 ton status

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    chech out the post about boring a d44 to make it a dana 60, custom 10 and 12 bolts are also being duscussed in this thread /forums/images/graemlins/thumb.gif /forums/images/graemlins/thumb.gif /forums/images/graemlins/rotfl.gif
     
  3. Muddytazz

    Muddytazz 1 ton status

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    14FF from any 3/4ton rig....but the only way your going to find a 14FF WITH 4.56's is a military rig, unless you get lucky and someone is selling one with the gears you want in it already. Only other thing you'll need is a conversion u-joint /forums/images/graemlins/thumb.gif
     
  4. big pappa b

    big pappa b 3/4 ton status

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    PM "WAYNE" He is on a trail run this weekend but he has 14BFF rears with 4:56's for sale. I'm getting one from him this month along with mt D60. He lives in PA so it's sort of close to ya

    Bryan
     
  5. rjfguitar

    rjfguitar 3/4 ton status GMOTM Winner

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    [ QUOTE ]
    14FF from any 3/4ton rig....but the only way your going to find a 14FF WITH 4.56's is a military rig,

    [/ QUOTE ]There are plenty of 3/4 & 1 tons that came with 4.56's that are civilian vehicles and aren't real hard to find. I even found a 14BFF with 5.13's that were factory.

    85K5 3/4ton,14boltFF,10bolt,9"lift,35"boggers,16.5x14 welds,406SBC/700r4 /forums/images/graemlins/k5.gif /forums/images/graemlins/angryfire.gif
     
  6. Eric M.

    Eric M. 1/2 ton status

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    Monster,

    The 14 Bolt Full Floater from a 3/4 ton will bolt right in, assuming your rig is of the 73 to 91 vintage. The 1 ton version will need to have the spring perches and shock mounts relocated. Stick with a 3/4 ton. Hopefully you'll find one with 4.56. If not, it might be a good time for that posi along with the new gears!

    Expect to pay $100 to $200 for a complete 14 Bolt FF w/ open dif.

    Good Luck,

    Eric M.
     
  7. Mastiff

    Mastiff 1/2 ton status Premium Member

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    [ QUOTE ]
    Expect to pay $100 to $200 for a complete 14 Bolt FF w/ open dif.

    [/ QUOTE ]

    Wow, that's cheap. It'd cost more for me to change the gears in my 12-bolt. Is this a functioning unit, or a rusty heap from a junkyard?
     
  8. rjfguitar

    rjfguitar 3/4 ton status GMOTM Winner

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    At the least, $200 should get you a 14FF in decent(running) shape with a posi and 4.10's or lower. I paid $400 for a front 3/4ton 10b in very good condition, good R&P,bearings,seals and a 14bFF W/posi,4.10's, and 70% brakes left. 14BFF's that have high ratios like 3.73 and higher are worth about as much change that is in your pocket in an used condition. /forums/images/graemlins/tongue.gif

    85k5,3/4ton,14boltFF,10bolt,9"lift,35"boggers,16.5x14welds, big horse 406SBC/700R4 /forums/images/graemlins/k5.gif /forums/images/graemlins/angryfire.gif
     
  9. Rolled

    Rolled 1/2 ton status

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    If you are going to replace a rear 10 bolt (6 lug) with the above recommended 8 lugs, you will also have to get 8 lug wheels /forums/images/graemlins/frown.gif

    A 12 bolt is stronger than the 10. Easy to find and cheap as well.

    [I could be wrong]
    You can get a 14sf from a 70's/80's rig, then go get some 6 lug axles out of a late 80's/90's 14sf and swap them. Maybe the backing plates too. This way you could stay 6 lug and run a much stronger rear.
    [/I could be wrong]


    Good luck
     
  10. rjfguitar

    rjfguitar 3/4 ton status GMOTM Winner

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    [ QUOTE ]



    You can get a 14sf from a 70's/80's rig, then go get some 6 lug axles out of a late 80's/90's 14sf and swap them. Maybe the backing plates too. This way you could stay 6 lug and run a much stronger rear.

    [/ QUOTE ]
    I would agree, this would be a good upgrade for a vehicle on the border of being past the limits of the rearend. If you find an 80's-90's 14sf use that don't look for an older one. I was told by a mechanic that a 14sf born with 8 lug axles cant be converted to 6 lug but I have a hard time believing that /forums/images/graemlins/rolleyes.gif Still the 14FF has it's advantages over the semi floater and should strongly be weighed in. /forums/images/graemlins/thinking.gif

    85k5,3/4ton,14boltFF,10bolt,9"lift,35"boggers,16.5x14welds, big horse 406SBC/700R4 /forums/images/graemlins/k5.gif /forums/images/graemlins/angryfire.gif
     

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