Issue with NBS 13" Rear Discs on GMT400

Discussion in 'Axles + Brakes' started by davkenrem, Jul 8, 2018.

  1. Supercharged111

    Supercharged111 I'm Awesome

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    I thought there was also a clocking issue with this? I.E. the 2 axle mounting flanges were 45 degrees off of one another.
     
  2. davkenrem

    davkenrem Supporting Member

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    There is, I'm using two right rotors and placing them at 10 o'clock and 2 o'clock on each rotor. That placed bleeder screw on top of each caliper.
     
  3. davkenrem

    davkenrem Supporting Member

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    I just re-read this, the axle flanges on my diff are not 45 degrees opposed, they are symmetrical. I think the late model axles are opposed. I have seen a picture of one and it is different from the GMT400 4X4 axle.
     
  4. jdla140

    jdla140 OBS Enthusiast

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    Could the 88-98 axle be converted to disks as shown here:

    https://www.performancetrucks.net/f...-5-8-lug-6-lug-conversion-552662/#post5438744
    ?

    I'm assuming the width would be damn close as he uses 88-98 14B SF axles, it would be a huge upgrade to have the 3/4 ton rear brakes and the express van rotors are super easy to come by.

    EDIT: This probably isn't any better than the SUV brakes that you did, I think its awesome that you got the 13" rotors to fit, but I'm wondering if this would require any spacers. I believe the 8 lug 14b SF in the NBS trucks shares the same tube/wheel bearing diamater as the obs trucks, unlike the NBS 6 lug 14 bolt that shares the tubes/bearings of a 10b.
     
    Last edited: Jul 9, 2018
  5. davkenrem

    davkenrem Supporting Member

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    I know that there is a NBS 9.5" that has narrows axle tubes at the flange end and takes a smaller diameter shaft.
     
  6. davkenrem

    davkenrem Supporting Member

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    Wheel arrived today...


    0711181459.jpg


    It fits. Mocked up the caliper.

    0711181459a.jpg


    Not much room to spare but it will work.

    0711181459b.jpg


    0711181500.jpg
     
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  7. jdla140

    jdla140 OBS Enthusiast

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    Love the wheel choice, May have to purchase some now that I know they'll fit!


    That would be any 6 lug 14 bolt sf in the NBS trucks, all of them had 10 bolt brake hardware AFAIK. That's why I wonder if the OBS 14 bolt could be converted using NBS 8 lug SF parts, as in that thread I had linked.
     
  8. davkenrem

    davkenrem Supporting Member

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    I guess the determining factor is the axle flange. If the bolt pattern is the same and it is the same distance from the end of the axle. If so you could use the same spacer that I did and bolt the 8-lug brakes to it. Agreed that it may not be any better, especially when the front brakes do most of the work.
     

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