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9 inch drums on an 8 inch axle?

Discussion in 'The Hokey Ass Message Board' started by marq, Oct 17, 2006.

  1. marq
    Joined: Aug 22, 2003
    Posts: 1,423


    So has anyone done this ?i want to change over my rear axle to 5 on 5 1/2 bolt circle the drums i have are too small for that pattern.I am having some 8 inch shafts tailored with that pattern but if i buy a whole 9 inch drum package deal can i get them to fit anyone?..................Marq
  2. squirrel
    Joined: Sep 23, 2004
    Posts: 49,508


    you mean a truck 9" brake setup? for a small bearing rearend? hmmmm....
  3. jusjunk
    Joined: Dec 3, 2004
    Posts: 3,138

    from Michigan

    Dont think so. Although they do make a brake kit to fit small bearing 9's and 8's they have a 5x41/2 pattern and i dont know if there is enuff room to make the drums 5 1/2 Why not run adapters?
  4. Deuce Roadster
    Joined: Sep 8, 2002
    Posts: 9,519

    Deuce Roadster
    Member Emeritus


    IF ...
    I understand the question correctly ...

    Some early Ford Broncos 9 inch rears came with a small wheel bearing ( like the 8 inch rears )


    SO ... you could use a set of those and get the backing plate and drum to match the wheel pattern of your new axles ...

    The small wheel bearing axles use a 10 inch brake drum and the large wheel bearing ones use the 11 inch brake drum like the Ford pickups of that era.

  5. Rio Grande Valley Deuce
    Joined: Jul 10, 2005
    Posts: 529

    Rio Grande Valley Deuce


    As I understand these brake kits, your backing plates, drums, and brake shoes need to be off of the same assembly/application.

    If your backing plate fits the housing, you should be okay (ie. large bearing housing/large backing plate as compared to the small bearing housing/small backing plate).

    I'm not sure that you would want to install large truck brakes on an 8 inch housing. These probably would not match anyway - I think the large brakes come with the large bearing (and backing plates) and need to be installed in a housing that matches the large bearing.

    My comments do not consider welding the large bearing housing ends to an 8 inch housing.

    Food for thought.

    Luck with the install - RGV
  6. 333 Half Evil
    Joined: Oct 16, 2006
    Posts: 1,440

    333 Half Evil

    I'm not sure, but there might have been 8" rears in some of the 70's F100 series light duty trucks...if so then all you need is the drums from one of them....I'm not 100% sure, but I think there were some....
  7. Flat Ernie
    Joined: Jun 5, 2002
    Posts: 8,406

    Flat Ernie
    Tech Editor

    To my knowledge, no Ford trucks came with 8" rears - I'm happy to be proven wrong on this - no emotional stake in it whatsoever.

    I'm not aware of any kits with the 5x5-1/2" pcd either. Everyone seems to want Chev or Ford (passenger) patterns...

    I think Deuce Roadster has the right angle - that's about the only combo I know of that might work & I wouldn't swear to it....
  8. marq
    Joined: Aug 22, 2003
    Posts: 1,423


    Nice to hear you alive and well Ernie..................Marq
  9. Gnashty1
    Joined: Jul 21, 2006
    Posts: 142


    There is a place called Bronco Graveyard < > in Brighton, Michigan. They seem to know their stuff, and have a wealth of tech info, as well as available parts, on their site. They show small-bearing 28 spline big pattern brakes for 9" rears, and have the parts available. To get to the tech section, follow the Customer Service link.


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