8 3/4 Backing plates SBP question

Brakes for your Classic Mopar

  1. Joker13

    Joker13 Well-Known Member

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    What Small bolt pattern backing plates do I need for 8.75 rear I’m building for 68 Barracuda.
     
    Last edited by a moderator: Nov 12, 2019 at 8:54 AM
  2. j061093409

    j061093409 1970 Dart Swinger 340 Reg FABO Gold Member

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    I should have some loaded units. Can check after work. In CT
     
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    • Dana67Dart

      Dana67Dart Like a fine wine, only getting better with age! FABO Gold Member

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      FYI 7 1/4 10x1 3/4 backing plates are a direct swap.
       
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      • Oldmanmopar

        Oldmanmopar Going left turning right FABO Gold Member

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        I have clean sets. Notice the one on the floor have a different bolt pattern. They are 7 1/4, also notice the different wheel cyl. holes for 67 ., 8 3/4 are the primered ones on the bench. I have several sets cleaned and very good condition they are cleaned, primer ed an ready to paint. $75 shipped or pick them up in east Pa. near Allentown for $55. Plates only . Park brake levers and any hardware is extra

        DSCN0646.JPG

        DSCN0650.JPG

        DSCN0649.JPG
         
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        • Jimacuda

          Jimacuda Well-Known Member

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          The hole in the center of the plate is smaller on the A body 7.25 than on the 8.75. Wont fit over the axle bearing. (72 back)
          7.25 plate wont fit 8.75 axle.
          Shoes, levers, etc. are the same.
           
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          • Dana67Dart

            Dana67Dart Like a fine wine, only getting better with age! FABO Gold Member

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            News to me... A few years ago I was assured the 7 1/4 10x1-3/4 brakes were a direct swap to an 8 3/4.
             
          • Oldmanmopar

            Oldmanmopar Going left turning right FABO Gold Member

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            The bare plates on the floor pictures above are 7 1/4 look at the different bolt pattern on the 8 3/4 first picture above . The last picture are fronts.
             
          • Jimacuda

            Jimacuda Well-Known Member

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            72 back won't fit, different axle flange size and bolt pattern.
            73-76 A body I believe fit. Still used the 10x1.75 brakes but used common axle flange pattern.
            76 up for sure. Just tore another late 70s 7.25 apart last week. Direct fit.
            But those are 10x2.5 shoes for 76 up.
             
          • toolmanmike

            toolmanmike FABO Staff Staff Member FABO Gold Member

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            To all who have posted here: I changed this thread to a question thread because it seems there may be multiple choices and until the right answers come out there's no sense in selling him something that isn't what he needs. Don't try to sell the OP a set you have here on the thread. Respect the rules and send him a PM instead. Thanks
             
          • Oldmanmopar

            Oldmanmopar Going left turning right FABO Gold Member

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            73 -76 7 1/4 backing plates for big bolt pattern will not work. They will only work with big bolt pattern drums the offset of the backing plate is different for the wider shoes. A good reference is if you go to install big bolt axles and use the big bolt drums with small bolt backing plates the drum hits the backing plate. The reason why everyone is always looking for big bolt backing plates when when installing after market axles.
             
          • Jimacuda

            Jimacuda Well-Known Member

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            I was refering to 73-76 A body 7.25 small bolt brakes w 10"x1.75" shoes, thats why I mentioned them specifically.
            Big bolt stuff was mostly 2-1/2".
             
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