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  1. #1

    Default Blown Out Front Hub

    I have a 1975 K5 Blazer, full time 4x4. I blew out the front driver's side wheel hub and I think it's called the spider gear(?). I'm a little buffaloed as to why I loose all drive to the front and rear differentials in normal 4x4, high or low. When I lock the differentials, I get power to the rear wheels and was able to get home, whew!
    Last edited by cdvntx; 01-05-2009 at 12:13 PM. Reason: left out a word

    1999 LS 2500 4x4
    7.4L Vortec

  2. #2

    Default

    The reason you lose all drive power is that your front diff is most likely an open diff and your transfer case acts as an open diff. Open diffs send power through the path of least resistance, which, with a broken hub, is to that axleshaft. Locking the transfer case forced a 50:50 split at the transfer case, and power was forced back to the rear axle.
    '98 K1500 Suburban LS 5.7 L 4L60E NV246 ARB
    '92 Ford Explorer XLT 4x4 4.0 L A4LD BW13-54 Trac-loc rear
    "My toys were the greasy cogs and springs and pistons that lay around all over the place, and these, I can promise you, were far more fun to play with than most of the plastic rubbish children are given nowadays." Danny in Roald Dahl's Danny The Champion of the World

  3. #3

    Default

    You need to convert that transfer case to a part time case.

  4. #4

    Default

    Quote Originally Posted by MrShorty View Post
    The reason you lose all drive power is that your front diff is most likely an open diff and your transfer case acts as an open diff. Open diffs send power through the path of least resistance, which, with a broken hub, is to that axleshaft. Locking the transfer case forced a 50:50 split at the transfer case, and power was forced back to the rear axle.
    I didn't realize that about this transfer case, but I guess that would explain it being full time and able to drive on asphalt...
    After pulling the hub off, it looks original and I'm surprised it could last this long...

    1999 LS 2500 4x4
    7.4L Vortec

  5. #5

    Default

    Quote Originally Posted by retired View Post
    You need to convert that transfer case to a part time case.
    Yeah, I'm sure there are many things that should be upgraded on this model. I only know enough about this stuff to be dangerous. I guess I need to bone up on some of this stuff and see what all can be done, but I sure do enjoy throwing it into a corner and nailing it with very little traction loss...

    1999 LS 2500 4x4
    7.4L Vortec

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