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D30 Help

Discussion in 'Intermediate CJ-5/6/7/8' started by 3b a runnin, May 14, 2023.

  1. May 14, 2023
    3b a runnin

    3b a runnin Active Member 2023 Sponsor 2022 Sponsor

    virginia
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    I'm working on a D30 for my 73. I want the E locker, and new 3.73's (on hand) and of course disc brakes. I have disassembled the 3.54 gears and had new ball joints installed. I bought new rotors, pads, calipers, bearings, etc. for the build. When I got down the wheel hubs and spindles that I was sure were for a disc brake unit, well they were not. They have smaller spindle, and bearings.
    Will a drum hub work with a disc brake spindle? I do have a set of disc spindles (bigger).
    How many parts will interchange with a old style disc brake setup?
    I have already bought parts for this style thinking I had wheel hubs on hand
    like this
    [​IMG]
    compared to the newer, I think, 2bolt mount, like this.
    [​IMG]
    any help appreciated
     
    Ol Fogie likes this.
  2. May 14, 2023
    3b a runnin

    3b a runnin Active Member 2023 Sponsor 2022 Sponsor

    virginia
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    Yes I have.
    [​IMG]
    I've been doing some searches and read about using the disc rear bearing and the drum outer bearing. It seems to work.
    I have also read about machining a flat place on the back of the hub so the disc will set flat against it.
    After laying the disc on the hub, the area with the white line looks like the spot. Anybody confirm that?
    [​IMG]
    because the chamfer is not deep enough on the disc correct?
    [​IMG]
    If all that works out, I have at least 1 more question
    I pressed out 1 of the studs and measured the holes in the hub and also the new disc.
    [​IMG]
    I forget exact numbers but,
    hub - .610
    disc - .670
    Do I drill the holes slightly in the hub or ??
     
  3. May 14, 2023
    Jw60

    Jw60 Sitting up n buckled down. 2024 Sponsor 2023 Sponsor 2022 Sponsor

    Sedalia MO.
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    The machined flat refers to the entire face the rotor will mount against. Your hub looks to be a cast finish requiring all the studs to be pressed out and the back side of the hub faced smooth. It does not need to be faced down deep but it cannot have the rough cast surface against the rotor.
     
    3b a runnin likes this.
  4. May 14, 2023
    3b a runnin

    3b a runnin Active Member 2023 Sponsor 2022 Sponsor

    virginia
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    OK I think I understand.
    Basically mate 2 machined surfaces
    Or try to buy a set of disc hubs
     
    Fireball and Jw60 like this.
  5. May 14, 2023
    Rich M.

    Rich M. Shoe salesman 2024 Sponsor 2023 Sponsor 2022 Sponsor

    Maryland
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    Buy the disc hubs. Machining drum hubs is a 50/50 crapshoot at best. You'll likely have too much runout, wheel stud retention issues etc.
     
    dnb71R2 and 3b a runnin like this.
  6. May 14, 2023
    3b a runnin

    3b a runnin Active Member 2023 Sponsor 2022 Sponsor

    virginia
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    I just put out a feeler for hubs.
    I would consider new ones if they are available
     
  7. May 14, 2023
    dnb71R2

    dnb71R2 SuperDave 2023 Sponsor

    Grand Mesa, CO
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  8. May 14, 2023
    3b a runnin

    3b a runnin Active Member 2023 Sponsor 2022 Sponsor

    virginia
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    dnb71R2 likes this.
  9. May 15, 2023
    3b a runnin

    3b a runnin Active Member 2023 Sponsor 2022 Sponsor

    virginia
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