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14 ff out of a 4X2 or a 12 bolt

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by 8_YOUR_H2, Apr 1, 2000.

  1. 8_YOUR_H2

    8_YOUR_H2 1/2 ton status

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    Well I have narrowed my axel purchase to a 14 bolt ff out of a 78 4X2 or a 12 bolt out of a 76 Blazer..35$ eaither way so I plan on overhauling them with new gears and a locker...I just dont know if the 14 bolt will work since it was out of a 4X2...I heard the pinion angle may be different. I can get the dana 44 out of the 78 blazer for 35 more bucks and do the set..I will also be installing a 4 inch susp and 3 inch body lift with 36" Micky's. Believe it or not these are the only axel replacements I can find in a 75 mile radius for a good price. Any suggestions or commens appreciated
     
  2. 88Jimmy

    88Jimmy 1/2 ton status

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    You need to look at the spring pads the K5 or Jimmy's
    are 42 1/4" and most older 14 Bolts are 40 1/2"
    you can get them rewelded add the shock mount need to be moved as well
    I'm having it done to mine now should be picking ot up monday.
     
  3. red450ih

    red450ih 1/2 ton status

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    Go with the 14 Bolt if you are going to rebuild the axles. If it is out of a 2WD truck it will bolt right in. There is no pinion angle difference between 4WD and 2WD.
     
  4. red450ih

    red450ih 1/2 ton status

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    All 73-87 trucks and 88-91 Blazers had the same spring pad width. 73-87 are 42 3/4" center to center and 67-72's are are 40" from center to center. More than likely you ended up with one out of a van or a 67-72 rear if the pads and shock mounts were different. Van rears are narrower all together. Hope yours come out good!
     
  5. 88Jimmy

    88Jimmy 1/2 ton status

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    red450ih why did the 14 bolt rear I pulled from a 81 GMC K3500 come with the spring pads at 40 1/2"
     
  6. 89Jimmy

    89Jimmy 1/2 ton status

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    I replaced both 10 bolts in my '89 with a dana 44 & 12 bolt set from a '76 blazer. The spring pads lined up perfectly. Even swapped the complete brake assemblies, so I still have '89 brakes on the '76 diffs. Ya' gotta' love that g.m. interchangeabilty. (Is that really a word?)
    John

    So Much to do, So LITTLE cash.
     
  7. 88Jimmy

    88Jimmy 1/2 ton status

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    Hey 89Jimmy
    your up early I'll pour you a cup of Coffee!!
     
  8. 8_YOUR_H2

    8_YOUR_H2 1/2 ton status

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    it is out of a 3/4 ton chevy pickup...Im going to take the e-brake cables and the rims with it...I appreciate your input
     
  9. red450ih

    red450ih 1/2 ton status

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    Was it a dually truck? Some dually trucks have narrower frames in the rear, but I don't think this is your case. If yours was 40 1/2", that is only 1/4" short and would only be 1/8" off on each side. What was different about the shock mounts on your 14?
    Thanks
     
  10. 88Jimmy

    88Jimmy 1/2 ton status

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    No its was not a dually truck
    The GMC k3500 14 bolt spring pads 40 1/4" Shocks 28 1/2"
    My 88 Jimmy spring pads 42 1/4" Shocks 35 1/2"
     

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