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How do I tell if I have 9" or 11" drums

Discussion in 'Early CJ5 and CJ6 Tech' started by S-Rage, Dec 21, 2005.

  1. Dec 21, 2005
    S-Rage

    S-Rage Adam Schrage

    Mountain Home,...
    Joined:
    Oct 22, 2005
    Messages:
    77
    Do you measure the inside diameter of the drums or the diameter of the backing plates.
    Inside diameter of my drums is 9 and the back plates measure 11. I got excited when I measured the backing plates thinking I already had 11" brakes.
     
    S-Rage, Dec 21, 2005
    #1
  2. Dec 21, 2005
    Mcruff

    Mcruff Earlycj5 Machinist

    Albertville, AL
    Joined:
    Sep 22, 2002
    Messages:
    5,349
    Then you have 9". You measure the inside of the drum.
     
    Mcruff, Dec 21, 2005
    #2
  3. Dec 21, 2005
    S-Rage

    S-Rage Adam Schrage

    Mountain Home,...
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    Oct 22, 2005
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    Thanks Mcruff thats what I figured. Now I have to find those bigger backing plates.
     
    S-Rage, Dec 21, 2005
    #3
  4. Dec 21, 2005
    S-Rage

    S-Rage Adam Schrage

    Mountain Home,...
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    Oct 22, 2005
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    So know that I know for sure that I have to upgrade the brakes does that mean that every thing from the backing plates forward is going to need to be replaced.
     
    S-Rage, Dec 21, 2005
    #4
  5. Dec 21, 2005
    lynn

    lynn Time machine / Early CJ5 HR Rep Staff Member

    Huntingdon PA
    Joined:
    Sep 20, 2002
    Messages:
    3,437
    Yep. Backing plates, shoes, drums.
    Best sources are 72-75 CJs, or some 70's postal Jeeps; 70's wagoneers.

    Or you can buy ready-to-install kits from R & P 4WD with all new components (except the backing plates, which are refurbed...
    http://www.r-p4wd.com/

    11" drums are great... drill them if you plan to be in alot of water... :shock:
    (search: drilled drums) :twisted:
     
    lynn, Dec 21, 2005
    #5
  6. Dec 22, 2005
    66cj5

    66cj5 Jeep with no name

    NorthWest Indiana
    Joined:
    Sep 10, 2003
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    2,084
    used the backing plates from an '71 bronco with '73 jeep drums and hardware. also used the bronco front cylinders all around.
     
    66cj5, Dec 22, 2005
    #6
  7. Dec 22, 2005
    panzer

    panzer Super Mod Staff Member

    Columbus, OH
    Joined:
    Dec 9, 2003
    Messages:
    1,245
    panzer, Dec 22, 2005
    #7
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