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99 GMC Sierra rear diff

Discussion in 'GM Powertrain' started by DylanL, Sep 29, 2013.

  1. DylanL

    DylanL New Member

    Is the rear end on my 99 GMC Sierra 4WD 8.5'' or 8.6''? I gotta order new spider gears and cant find a definite answer to what i have.
  2. 99'HEARTBEAT

    99'HEARTBEAT Moderator Staff Member ROTM Winner Platinum Contributor 1000 Posts


    Your 1999" GMC Sierra 4WD....has 8.625 Rear Axle.
    Last edited: Sep 29, 2013
  3. DylanL

    DylanL New Member

    Thanks man. Ill go order my new gears.
  4. 99'HEARTBEAT

    99'HEARTBEAT Moderator Staff Member ROTM Winner Platinum Contributor 1000 Posts

    Your Welcome....:glasses:

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