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Buick Brake Drum Tech

Discussion in 'The Hokey Ass Message Board' started by gashog, Jul 26, 2006.

  1. Andy
    Joined: Nov 17, 2002
    Posts: 4,797

    Andy
    Member

    The 40 hubs must be machined down on the OD to fit in the bottom of the cone shape of the center of the Buick hub. The pictures of 48 hubs would show the hub hanging over the edge of the drum. Cutting the hub means the outer support on the wheel is not making contact with anyting as the drum is angling away. 40 hubs can be drilled for the small patern but must be spotfaced as the surface is angled.
    I am very much concerned with folks trying to use the 40 hubs and not knowing the problems.
    The spacing is off in every dimesion stack I have done so it is possible but difficult to get the drum to cover the shoes completly. I have seen assemblies on cars where you could look down at the drum and see the shoes.
     
  2. Gareth
    Joined: Jun 18, 2008
    Posts: 86

    Gareth
    Member
    from San Diego

    Andy, in your dimension stacks, are you considering 40's ford backing plates or F2/F250 backing plates?

     
  3. gimpyshotrods
    Joined: May 20, 2009
    Posts: 18,699

    gimpyshotrods
    ALLIANCE MEMBER

    This bears repeating for emphasis. Skip this step, and that popping sound you hear will be the drum breaking into numerous pieces.

    Ask me how I know.:eek:
     
  4. rcnut223
    Joined: Oct 12, 2006
    Posts: 1,255

    rcnut223
    Member
    from wisconsin

    I can second that, I broke a drum this way!!! The hub was pressed from the top and bottom when made. This expanded the edge of the hub again the hole in the drum. You will need to grind the hub slightly to releave and it will come out , if you don't do this you will break the drum.
     
  5. RustyNCA
    Joined: Feb 18, 2009
    Posts: 406

    RustyNCA
    Member

    What if you are wanting to run 40 hubs with the big 5x5.5 pattern, 40 backing plates and spindles and 66 Buick drums? Is it better to run the 40 hubs or the buick hubs?

    Thanks
    RustyNCA
     
  6. I ran 40s with no problems
     
  7. Andy
    Joined: Nov 17, 2002
    Posts: 4,797

    Andy
    Member

    I would only run the 46-8 hubs.The buick drum does not have a big enough mounting surface to contact the outer support nubs on the Ford wheels. The 46-8 hubs are considerably bigger in diameter. You could make a support plate that was the reguired diameter to support the wheel and put it on the outside of the drum. The 40 hub would still have to be greatly reduced in diameter to go inside the Buick drum. The new support plate would only be clamped at the inside and would need to be pretty thick. The whole thing is not as nice as using the 46-8 hub.
     
  8. RustyNCA
    Joined: Feb 18, 2009
    Posts: 406

    RustyNCA
    Member

    Thanks for the help Andy.

    Ended up going with the 40 hub. And yes, we had to machine the hub down just a small amount and made a sleeve to locate the drum on the hub . Yep, after looking at it, we made a 8" dia spacer to run on the outside of the drum to support the wheel. Hopefully I will get to putting it all back together this weekend. We will see, our new 3 week old son seems to keep distracting me :D

    One side on, one to go... well, and get the finished spacers.

    Cheers
    RustyNCA

    [​IMG]
     
    Last edited: Jan 20, 2013
  9. I had to remove 0.625 from the drum edge using 1948 Lincoln rear backing plates.

    Frenchy
     
  10. NeedFiber
    Joined: Dec 20, 2011
    Posts: 106

    NeedFiber
    Member

    Which hubs did you run Frenchy? Inside or outside of the drum?
     

  11. I ran the hub on the outside of the drum and welded a spacer on the inside with a grade 8 bolts I bought the pair from Wilson Welding in Texas.

    Frenchy
     
  12. Here pictures of the front drums.

    Frenchy
     

    Attached Files:

    Barnmiester likes this.
  13. great job and good post !!!
     
  14. RustyNCA
    Joined: Feb 18, 2009
    Posts: 406

    RustyNCA
    Member

    Here is our finished product.

    90 fin drums on an early 40 Ford axle and backing plates. Seems like it brakes better than with the 40 drums, but I am sure that is because I spent more time adjusting the brakes in this time.

    [​IMG]
     
  15. metalix_421
    Joined: Mar 24, 2010
    Posts: 890

    metalix_421
    Member

    Dang good info here. Thanks
     
  16. A little well intended spam. When it comes to Buick drum conversions there is no better authority than Bob Wilson of Wilson Welding and Machine. Bob can machine your 46-48 hubs for the Buick drums and drill any bolt pattern you want. He also sells his own manufacture hubs. He has done a couple of sets of hubs for me and several for friends as well. We are all satisfied customers.
     
  17. brady1929
    Joined: Sep 30, 2006
    Posts: 8,677

    brady1929
    Member

    great info here, thanks
     
  18. The backing plates I use in the front are from a 1947 Lincoln Zephyr rear and I welded the parking brake where the cable was you can see in the picture some JB weld was use to finish off.

    Frenchy
     

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