NBS/Astro knuckle brake upgrade.

Discussion in 'Axles + Brakes' started by 99GMT425, Sep 15, 2013.

  1. 99GMT425

    99GMT425 Newbie

    Messages:
    9
    Likes Received:
    1
    Joined:
    Sep 15, 2013
    I have not done a 2wd swap but the Astro vans used the 2wd and 4wd knuckles from the gmt400 trucks in the 2wd and and awd applications respectively. I don't see why 2wd Astro knuckles wouldn't swap to a 2wd truck but again I have not tried it. I have only done the awd astro knuckles to a 4wd gmt400.
     
  2. 454cid

    454cid Sooper Pooper

    Messages:
    1,925
    Likes Received:
    339
    Joined:
    Sep 5, 2010
    Location:
    The 26th State
    Aren't they kind of small? I thought the Astro was originally based on the S10.
     
  3. ccreddell

    ccreddell I'm Awesome

    Messages:
    1,170
    Likes Received:
    93
    Joined:
    Aug 6, 2010
    Location:
    Medford, OR.
    Well, the early Astros were S10 based, but the OP is saying that the late model 6-lug astros are using a spindle that is close to the GMT400. Thats interesting. If, in fact, they are, and use a hub instead of a shaft with inner and outers, then there are possibilities. I found a hub that bolts to the GMT800 spindles that is 5-lug (although its 5.5x5), but that can be redrilled. Oh, and another thing; A Jeep SRT8 uses a 15" rotor that is 5x5. Yep, Im already playing with that....
     
  4. someotherguy

    someotherguy I'm Awesome

    Messages:
    4,138
    Likes Received:
    1,267
    Joined:
    Sep 28, 2013
    Location:
    Houston TX
    ...and I believe from 2012-up, big ol' 6 piston Brembo front calipers. :D

    Just check the pricing on the consumables, though. Those OEM-application big rotors are usually pretty expensive. Yeah you can score them used for a deal, but you'll need to replace them eventually and it's tough to find someone selling used ones separate from the calipers. The JGC SRT has been around long enough though that the aftermarket may be offering them. Centric just finally released their copy of OEM Hellcat rotors for significantly less than OEM.

    Not exactly the same caliper/rotor setup as the JGC, but I swapped Hellcat 15.4" 2-piece rotors and 6 piston Brembos, onto my 300C SRT8 -
    [​IMG]

    The fullsize modern Mopar cars have a 5x115mm bolt pattern which is just a few RCHs larger than 5x4.5" (small Ford pattern) but there appears to be plenty of room on the rotor hat that a good machinist could dual-pattern it for 5x5" if you can find or re-drill a suitable hub...a good set of Hellcat front brakes can be had used for about $1000-$1200 or so.

    Richard
     
  5. 99GMT425

    99GMT425 Newbie

    Messages:
    9
    Likes Received:
    1
    Joined:
    Sep 15, 2013
    Yes my original post was based on the fact that 90-02 awd astro vans used the exact same knuckle as 1500 4wd gmt400 trucks. GM designed the 03 and up astro awd knuckle to bolt in place of the gmt400 knuckle on the astro and use the newer style brakes and hubs. (The location of the ball joint and tie rod holes was so close for me, my truck was still in alignment after the knuckle swap)

    For those interesed in bolt on brembo brakes, the 18 and 19 full size suvs and old body style trucks had a 6 piston brembo option that bolts right to these astro knuckles. Chevy logo part# 84263234, gmc logo part# 84263235
     
    Last edited: Apr 16, 2019 at 6:54 AM
  6. 454cid

    454cid Sooper Pooper

    Messages:
    1,925
    Likes Received:
    339
    Joined:
    Sep 5, 2010
    Location:
    The 26th State
    Wow, I didn't realize they made AWDs as early as 90. I thought that was more recent. Reading the Wikipedia article, it seems the original Astro used parts from more than the S10.... the front suspension was modified B-body.

    Too bad there wasn't an 8-lug Astro :)
     
  7. someotherguy

    someotherguy I'm Awesome

    Messages:
    4,138
    Likes Received:
    1,267
    Joined:
    Sep 28, 2013
    Location:
    Houston TX
    Yep about $2K+ depending on where you buy 'em. I was looking at them for my Silverado SS as they should fit without issue, but, so far I haven't seen the service parts being offered separately. That 2K could turn into a whole lot more when it's time to replace pads or rotors, as it was originally with the Hellcat Brembos.

    Richard
     
  8. 99GMT425

    99GMT425 Newbie

    Messages:
    9
    Likes Received:
    1
    Joined:
    Sep 15, 2013
    85263246 pads
    84023777 84024778 rotors
    About $750
     
  9. someotherguy

    someotherguy I'm Awesome

    Messages:
    4,138
    Likes Received:
    1,267
    Joined:
    Sep 28, 2013
    Location:
    Houston TX
    Good to know they're available now but I think you mistyped the 2nd rotor part #; it's 84023778. Can't find the pads with the # you posted, either.

    I wonder why there are two different part #'s for the rotors? They appear smooth in the kit pictures, not slotted, so I don't understand why there would be 2 part #'s as they should be identical.

    Richard
     
  10. 99GMT425

    99GMT425 Newbie

    Messages:
    9
    Likes Received:
    1
    Joined:
    Sep 15, 2013
    Pads are 84263246
     

Share This Page