I need some technical info on a B-body disc brake swap

Discussion in 'Brakes for your Classic Mopar' started by SGBARRACUDA, Apr 16, 2018.

  1. SGBARRACUDA

    SGBARRACUDA ROY FABO Gold Member

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    A friend of mine bought a disc brake set up off a E-body? to switch his 66 Coronet toDisc brakes. He ran into a problem on the lower Ball Joints. He ordered new BJ's but the bolt holes on the lower BJ's are further apart than on the new BJ's. Any idea what spindles he has? Or what BJ's he needs to buy?
     
  2. myduster360

    myduster360 FABO Gold Member FABO Gold Member

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    FIrst think is to figure out if the spindles are wrong or the Ball joints.

    Do you know the part # of the new LBJ he bought?

    Not sure year your spindles came off but the 73 Ebody disks spindles should be 4.325" bolt spacing on the ball joints


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  3. SGBARRACUDA

    SGBARRACUDA ROY FABO Gold Member

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    He is double checking but he says they are Moog 781 and 783.
     
  4. myduster360

    myduster360 FABO Gold Member FABO Gold Member

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    As long as they're boxed right, those are the correct part numbers for all Ebodies 70-74.
    Good idea to measure both the spindle and ball joints
     
  5. SGBARRACUDA

    SGBARRACUDA ROY FABO Gold Member

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    I have him measuring both right now. I'll post when I get the info.
     
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    • SGBARRACUDA

      SGBARRACUDA ROY FABO Gold Member

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      Yeah we are thinking they didn't come off a E body. Ok he came up with 4.54 inches on the disc spindles?
       
    • SGBARRACUDA

      SGBARRACUDA ROY FABO Gold Member

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      Oh and the disc spindle BJ's are longer overall also.
       
    • myduster360

      myduster360 FABO Gold Member FABO Gold Member

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      • SGBARRACUDA

        SGBARRACUDA ROY FABO Gold Member

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        Ok, I think we figured out he has 73 C-body spindles. Or the 74-78 C-body. Thanks myduster360 for all your help.
         
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        • 68383GTS

          68383GTS Well-Known Member

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          I have a set of spindles if he needs them.
           
        • SGBARRACUDA

          SGBARRACUDA ROY FABO Gold Member

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          Are they B-body spindles?
           
        • 68383GTS

          68383GTS Well-Known Member

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          Yes 71-72 b body
           
        • SGBARRACUDA

          SGBARRACUDA ROY FABO Gold Member

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          I will let him know and see if he is interested. Thanks
           
        • 72bluNblu

          72bluNblu FABO Gold Member FABO Gold Member

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          Just remember that the 71-72 B body spindles use a different wheel bearing than all the 73+ rotors. The rotors for those are specific to 70-72 E-bodies and 71-72 B bodies. Originally they were a 2 piece rotor, and for awhile they were quite a bit more expensive to replace. There's now a 1 piece rotor made to fit these applications, it costs a little more than the 73+ rotors but they're readily available.

          You can also use a bearing adaptor for those spindles from DoctorDiff to use the 73+ rotors.
           
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