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disc brake conversion kit for 8 lug set up on a 57 chevy truck?

Discussion in 'The Hokey Ass Message Board' started by DG Racing, Oct 1, 2010.

  1. gimpyshotrods
    Joined: May 20, 2009
    Posts: 16,930

    gimpyshotrods
    ALLIANCE MEMBER

    Look for a front rotor from a 3/4-ton Suburban 4x4, circa 1985. They are separate from the hub.

    Like this:
    [​IMG][​IMG]

    They are, however, designed to be mounted on the backside of the hub, so you may need to use the lug bolts from that vehicle too, and have the holes in the hub opened up a bit. They register on a shoulder on the hub, so a little machine work to produce the shoulder on the existing hub would be in-order. You might be able to get them on from the outside of the hub with some machine work too.

    The calipers that go with these are cheap, and are of the two slider-bolt variety, which are pretty easy to mount:
    [​IMG]
    If you go the mount-from-outside-the-hub route, pay close attention to the inside of the rotor hat when selecting them. Some aftermarket rotors are machined in this area, some are rough finished, even inside the same store. You will want the machined ones. In this case, you'd turn down the hub so the rotor registers on the o.d. of the hub with a gentle press fit.
     
    Last edited: Oct 1, 2010
  2. squirrel
    Joined: Sep 23, 2004
    Posts: 45,300

    squirrel
    Member

    a bit over 70" to the outside of the tires, widest part.

    Some more pics from the front
     

    Attached Files:

  3. gimpyshotrods
    Joined: May 20, 2009
    Posts: 16,930

    gimpyshotrods
    ALLIANCE MEMBER

    That one is on a later model dually frame, with widened rear fenders. Frame swaps are not for the faint of heart, or the thin of wallet.
     
  4. DG Racing
    Joined: Dec 11, 2009
    Posts: 44

    DG Racing
    Member

    ok so a 1987 with 74.5 is to much :(

    i whant it low so it needs to be Maximum 71 inch wide

    Maybe Ford or dodge Axle are ok?
     
  5. DG Racing
    Joined: Dec 11, 2009
    Posts: 44

    DG Racing
    Member

    i dont think now that is on a 1984+ frame the front wheel are in the fenders not out of the fenders :confused:

    But will be happy to talk to the owner of that truck
     

    Attached Files:

    Last edited: Oct 1, 2010
  6. i have seen guys narrow those later front crossmembers to use in the earlier trucks. all the newer stuff with good brakes is going to be too wide.
     
  7. Richard/SIA
    Joined: Mar 22, 2010
    Posts: 246

    Richard/SIA
    Member
    from No. Nevada

    An under the floor power brake master cylinder system is readily available at moderate cost from the vintage Chevy truck specialist.

    Still drum brakes, but much less pedal effort.

    Towing you will be limited to 55 MPH by law.

    Fix the cam in your engine, drive the truck enough to bed-in the new brake shoes, you will see the stock brakes are pretty good unless you drive much faster than the truck is designed for.
    Adding power brakes will give it a more modern feel.
     
  8. str8axle55
    Joined: Dec 19, 2006
    Posts: 355

    str8axle55
    Member
    from MA




    73-91 1 ton`s with the square body are basically the same. That truck could very well be a frame swap, the wheels tuck in nice because it is a dually, look at the front wheels. I think all of the 88 and up new body style trucks have unitized hub/ bearing assemblies. The solid front axle was only used after 88 in some 1 ton trucks(crew cabs), Blazers, and Burbans up till 91 when they changed them over to IFS.
     
  9. bulletproof1
    Joined: Feb 23, 2004
    Posts: 2,080

    bulletproof1
    Member
    from tulsa okla

    the rotors that gimpy showed is the easiest way to go.ive put disc on all kinds of axles doing it this way..most newer cars and trucks have this set up.
    as for the the 4x4s i narrow the front ends all the time... all i need is the spring mounting width and the over all track width.
    few years back a put a 1 ton chevy front axle(4x4) under a 57 chevy pickup,looked factory.
     
  10. DG Racing
    Joined: Dec 11, 2009
    Posts: 44

    DG Racing
    Member

    Hy Richard :)

    Richard is the guy that sold me the 1957 truck and if anybody is looking for a elcamino check richard ads :)

    Richard i will try the truck first to see how it stops
    and i will put back the dually wheel (16 inch) in front and back so please can you give me the front hubs .
     
  11. DG Racing
    Joined: Dec 11, 2009
    Posts: 44

    DG Racing
    Member

    i just mesure a 1 tons dually 1987 and its 74 1/2 also so its to wide also :(
     
  12. gimpyshotrods
    Joined: May 20, 2009
    Posts: 16,930

    gimpyshotrods
    ALLIANCE MEMBER

    Ahh, that gives me an idea. He could build, or have built up, an axle a-la the 2WD Jeep Cherokee (1984-2001). They were exactly the same setup as the 4x4 one, but just a tube that went from one inner knuckle to the other, without stopping off at a center section along the way.

    Some DOM, a couple of inner knuckles, some spring perches, and a trip to the local self-service yard, and you've got a nice solid axle.:D
     
  13. squirrel
    Joined: Sep 23, 2004
    Posts: 45,300

    squirrel
    Member

    ...neat idea, but the truck would sit up pretty high! The stock axle has a hefty drop, maybe 5 inches. And I doubt there's room to put a tube axle over the spring, without having it hit the frame
     
  14. See if THIS may give you some ideas...joe
     
  15. Scarebird
    Joined: Sep 26, 2006
    Posts: 857

    Scarebird
    Alliance Vendor
    from ABQ, USA

    We now offer a setup for the 3/4 ton 59-71 Dodge - uses the same type of rotor Gimpy shows. I will look and see how long GM used that spindle/hub combo - may be worth looking into.
     
  16. squirrel
    Joined: Sep 23, 2004
    Posts: 45,300

    squirrel
    Member

    Spindle was used on 3/4, 1 and 1.5 ton trucks from 53-59

    The non-dual hub was used 47-59
     
  17. gimpyshotrods
    Joined: May 20, 2009
    Posts: 16,930

    gimpyshotrods
    ALLIANCE MEMBER

    Aw, they have a CNC bender up the street. It could do 3" x 0.50" wall DOM, no problem.
     
  18. 51farmtruck
    Joined: Jul 23, 2007
    Posts: 854

    51farmtruck
    Member

    Hi; I think if those big 3/4 ton drum brakes are set up right( drums turned, shoes arced to each drum, semi metalic shoe material,) they work great,drum brakes have a much larger surface area than disc brakes and work better untill they get hot, aluminum wheels would help dissipate the heat,drilling holes in the face of the drum to get rid of some of the gasses might help and along with good trailer brakes I see no problem.I have a dodge truck with big drum brakes on it and you have to be careful when its empty or it will throw you through the windshield! Chris
     
  19. Scarebird
    Joined: Sep 26, 2006
    Posts: 857

    Scarebird
    Alliance Vendor
    from ABQ, USA

    That year spread is pretty good - I ordered a spindle and hub, along with a few others (49-53 Ford pass., 64-67 Econoline) for engineering samples.
     
  20. jetnow1
    Joined: Jan 30, 2008
    Posts: 1,479

    jetnow1
    Member
    from CT
    1. A-D Truckers

    Please keep us advised on this- I for one am interested in a conversion for a 3/4 ton Chevy (1950). Jim
     
  21. Scarebird
    Joined: Sep 26, 2006
    Posts: 857

    Scarebird
    Alliance Vendor
    from ABQ, USA

    That is good - we will need a test customer in a little bit...
     
  22. or just a thought.. I had a 72 champion motorhome with front drums and they were huge but still fit behind 16'' dually wheels. and it stopped great... maybe swapping the front straight axle from a motorhome with bigger front brakes might be easier....
     
  23. Scarebird
    Joined: Sep 26, 2006
    Posts: 857

    Scarebird
    Alliance Vendor
    from ABQ, USA

    We have a test set now.
     
  24. 39cent
    Joined: Apr 4, 2006
    Posts: 1,569

    39cent
    Member
    from socal

    I am doing a disc sertup on my 39 chevy straight axle car, like we did bakinthday. I had a 50 chev 5 bolt drum brake setup already on. I seperated the drums from the hubs and used a 64-82 corv. rotor, and it fit directly on the 50 chev hub. Now I know yours is 8 lug truck, but you might be able to adapt a later removable 8 lug rotor to your 8 lug hubs, just an idea. oh then make up a mounting plate. ???
     
  25. gas pumper
    Joined: Aug 13, 2007
    Posts: 2,949

    gas pumper
    Member

    I have a 70 C-30 one ton. It was a camper special with a box. Now it's a flatbed. It's an IFS, but now weighs about 4500 empty. It has drums, and 8 lug dually 16's It will lock the front wheels when trying to stop hard. So there is more brake there than you can use. I know it's not the same set up as your truck, but I'd think the brake sizes were very similar size and stopping power too.

    The drag racers of the late60's early 70's used these one tonners for ramp trucks and cruised the country match racing and carried a lot of weight.
     
  26. Slag Kustom
    Joined: May 10, 2004
    Posts: 4,312

    Slag Kustom
    Member

    i have done the conversion with 1999 chevy 3500 rotors and calipers. stock hubs got cut on the backside to index the rotor then new studs where pressed in to hold the rotors on. buy loaded calipers the come with the bracket that bolts to the knuckle and just make a simple bracket the bolts solid
     
  27. junkyardroad
    Joined: Oct 3, 2007
    Posts: 410

    junkyardroad
    Member
    from Colorado

    FWIW I wanted an 8 lug setup on my 54 F250. I found everything these guys have already said. So, since the spindles are the same as a F100, I used the 5 x 5.5 disc conversion and a 9 inch.

    My conclusion is that it would be easier, faster, and better to adapt vintage tin to a later chassis. Non-HAMB-friendly, but a worthwhile consideration.
     
  28. Did you ever find a conversion for the straight ale 8 lug front end, I am going through the same headache with a 54 3800 I must convert to disc brake...
     
  29. Slag, have you got some pics of this, I am trying to do a disc brake conversion on my 54' 3800 1 ton dually
    is, this the same?
     
  30. jetnow1
    Joined: Jan 30, 2008
    Posts: 1,479

    jetnow1
    Member
    from CT
    1. A-D Truckers

    If you check the 67-72 chevy truck forum, go to the 47-59 message board, then click on projects and builds
    there is a post by dwcsr titled disc brake swap for 3/4 ton and 1 ton. It gives a very well detailed writeup
    or how he did this. Not the only way, but one approach which used modern tapered bearings as well.
     

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