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What Is This Conglomeration Of Disc Brake Parts.......

Discussion in 'Early CJ5 and CJ6 Tech' started by Norcal69, Mar 20, 2018.

  1. Mar 20, 2018
    Norcal69

    Norcal69 Out of the box thinker 2024 Sponsor 2023 Sponsor 2022 Sponsor

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    I am trying to decipher what all these parts came from and if I can use them on the drum brake D30 that I just picked up.
    I purchased a D25 a while back for the 2 hole knuckle. With it came a powerlock and these disc brakes.
    The Rotors are about 1 3/16" thick.
    Rotors slide over the hub like a rear disc hat.
    Calipers appear to be GM full size I have searched the casting number with no luck.

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  2. Mar 20, 2018
    47v6

    47v6 junk wrecker! 2023 Sponsor 2022 Sponsor

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    chevy calipers and 1977 jeep disks with chevy backer plate. Run em!

    Those hubs are probably 2a
     
  3. Mar 20, 2018
    Norcal69

    Norcal69 Out of the box thinker 2024 Sponsor 2023 Sponsor 2022 Sponsor

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    Wow, that was quick, thank you!
    Do I run the D30 drum brake spindle, bolt on the chevy caliper bracket, and just slide the jeep disks over my D30 drum brake hub?
    What is throwing me off is that on my setup the disk goes on the outside of the hub. Every conversion I can find uses the disk behind the hub.
    I have gotten lost in the vortex of D30 drum brake knuckles vs disc brake knuckles, spindles,hubs ect......
     
  4. Mar 20, 2018
    47v6

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    The drum hubs aren't machined flat to run a disk. You *can* get lucky and get one to run true... Personally I would get 6 hole disk hubs and run them with disk spindles too, but you can mix and match if you use the correct D30 bearings. Thats the easiest way. I have also run those 2a hubs on drum d30 spindles. They all work together aside from the D30 disk spindles. Even the later bearings will fit into the d25 hubs.. If you have time you can make it all work.... Pretty much you could take the whole assembly as it is and bolt it all on as is on the d30...

    I did and it worked just fine, but I exchanged all of it for front and rear D30 disk spindles/hubs and disk brakes when I could for interchangeability.
     
  5. Mar 20, 2018
    Norcal69

    Norcal69 Out of the box thinker 2024 Sponsor 2023 Sponsor 2022 Sponsor

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    I did some looking online and I am only seeing 1 1/8" thick rotors for a 77 cj. The rotors that I have are a full 1 3/16" thick. Also the rotor is mounted on the hub face and is sandwiched in between the hub and the wheel.
     
  6. Mar 20, 2018
    nickmil

    nickmil In mothballs.

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    Not a Jeep or Scout rotor. Those mount on the back of the hub and have a shallow hat. The depth of the hat and thickness of the rotor indicates they "could be" 1/2 ton Ford rotors. GM style caliper mounts and calipers.
     
  7. Mar 20, 2018
    47v6

    47v6 junk wrecker! 2023 Sponsor 2022 Sponsor

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    Ha, I guess I am fully of BS.. I defer to the expert and will go sit in my corner :rofl:

    The only way to be sure of an answer on the internet is to post the wrong one(y)
     
  8. Mar 20, 2018
    WYOMIKE

    WYOMIKE Oct 1971 pic

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    upload_2018-3-20_14-27-28.png

    Don't know anything about your questions, but do know that your telling your age if you bought these new. I have a set just like yours and mine were used when I got them over 30-40 years ago. Still use them all the time. Love them for quick measurements and want a reading in fractions instead of decimal.

    :)
     
  9. Mar 20, 2018
    Norcal69

    Norcal69 Out of the box thinker 2024 Sponsor 2023 Sponsor 2022 Sponsor

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    Nick,
    Thank you for chiming in. It looks like it may be a ford rotor like you thought. It appears to be a 76-93 F150 rotor.
    Because the rotor us used as a hat, is there any reason that I couldn't use the drum brake hubs and spindles that came on my D30?
     
  10. Mar 20, 2018
    Norcal69

    Norcal69 Out of the box thinker 2024 Sponsor 2023 Sponsor 2022 Sponsor

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    No harm in chiming in, It was a learning experience for the both of us. :beer:
     
  11. Mar 20, 2018
    Norcal69

    Norcal69 Out of the box thinker 2024 Sponsor 2023 Sponsor 2022 Sponsor

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    I carry slide calipers in my pocket even on Sundays. I work in a mill and check rip with and resaw thickness a couple times an hour. I'm only 30, but I am starting to struggle to read the measurement. :banghead:
     
  12. Mar 20, 2018
    nickmil

    nickmil In mothballs.

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    Should be able to. The only question is if the inside hat or the outside of the hub were machined to mate up. It's possible they were. If so may have to use as a set on the 30. I've never done that combination before so not sure how it was made to work or if it mated right up. Should be a virtual bolt on to a drum brake 30 as long as you use the same part number bearings, races, and seals that are in the hubs now as dimensionally drum brake 30 and closed knuckle spindles are pretty much the same.
     
  13. Mar 20, 2018
    nickmil

    nickmil In mothballs.

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    Meh. We're all here to learn. I learn stuff here all the time I was wrong about :)
     
  14. Mar 21, 2018
    Norcal69

    Norcal69 Out of the box thinker 2024 Sponsor 2023 Sponsor 2022 Sponsor

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    Thank you for the info. It looks to me like the only difference between drum 30 and closed knuckle spindles is the roller bearing that supports the axle shaft.
    It does appear that the outside diameter of the hub has been turned down to fit into the ford rotor. That's pretty easy to do on my lathe.
     
  15. Mar 23, 2018
    jeepermc

    jeepermc Active Member

    Western WA
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    I was thinking the same thing. Rotor isn't what I'm used to seeing with the GM brackets and calipers. The 77 Jeep rotors I typically use mount behind the hub like you said. Would Ford rotors have the right size center hole to fit over the Jeep hub?
     
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