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u bolt size 14 bolt ff

Discussion in 'The Garage' started by dammit32, Sep 28, 2002.

  1. dammit32

    dammit32 1/2 ton status

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    swapping and the parts store doesnt know the axle tube size for my 78 3/4 ton 14 bolt ff...anyone help?
     
  2. outlaw612

    outlaw612 1/2 ton status

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    Axle tube size is 3 3/8". I believe you will need 3 1/2"x 8"x 5/8". Those are for stock size. If you have lift blocks, adjust the length accordingly.
     
  3. thatK30guy

    thatK30guy 1 ton status Premium Member

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    What outlaw said.../forums/images/icons/wink.gif
     
  4. chulisohombre

    chulisohombre 1/2 ton status

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    yeah what they said.lol
     
  5. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    Why would you say to use a 3 1/2" U-bolt if the housing is 3 3/8"?
     
  6. BlueOx

    BlueOx 1/2 ton status

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    If the axle is 3 3/8" you would need an 1/8" more to clear the axle housing unless you planned to hammer it on. The extra 1/8" would make the size 3 1/2". Not trying to sound like an a$$ just letting you know.

    Charles
     
  7. outlaw612

    outlaw612 1/2 ton status

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    If you use the same size as the axle tube, it will spread the u-bolt slightly ang youll never be able to get the spring plate over the u-bolts.
     
  8. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    When I swapped in my 14bff I used the proper size u-bolts of 3 3/8" and it works just perfect. If you use a larger u-bolt I can see how you would have to squeeze it together to go through the spring plate and that isn't correct. The factory U-bolts that I removed from the donor truck were also 3 3/8".
     
  9. outlaw612

    outlaw612 1/2 ton status

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    Maybe just a little difference from brand to brand. I know the 2 times I have done an axle swap I had to buy a 3 1/2" u-bolt be cause by the time I got the 3 3/8 over the axle it was spread way to far to fit in the spring plate. I buy my u-bolts from a farm store here locally. The 3" from the same company works fine on the front.(D44) /forums/images/icons/confused.gif
     

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