Rear-end gears

Discussion in 'Chevy Suburban Forum (GMC Yukon XL)' started by joeray007, Apr 18, 2008.

  1. joeray007

    joeray007 New Member

    Just a thought...

    Does anyone know what gears are in my 99 'burb?

    C1500, Stock 350 CID, SLT

    Is it 3.42's?
    Is it posi-traction (I don't think so)

    Would it be better to get posi and if so, 3.42 or 3.73?
  2. Crawdaddy

    Crawdaddy Moderator Staff Member Platinum Contributor 1000 Posts 100 Posts

    If you look at the RPO codes in the glovebox, one of them is for the rear end gear ratio.

    I'm not 100% this list is good enough for truck RPOS, but here's a list. It looks like the RPO code you're looking for starts with a G

  3. joeray007

    joeray007 New Member

    If you pdf is correct, then I have 3.42 positraction limited slip rear.


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