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2003 gmc sierra Z71 5.3 tranny problems

Discussion in 'GM Powertrain' started by jeffz0rz, Aug 29, 2009.

  1. jeffz0rz

    jeffz0rz Member

    have just over 70 thousand miles on her, she has been babies since day one i can tell. january she just got her 2nd pair of tires ever. picked her up with 60 thousand miles. heres the problem, feel a bump when going from 1st to 2nd, slips a bit when i use any passing gear, will sometimes miss a shift (if thats possible on an auto) and go into neutral, and sometimes will up shift way too soon. like getting on the freeway it will go through the gears just fine, but goes into 5th way too early. any idea whats going on? thanks
    jeff
  2. Jimmiee

    Jimmiee Epic Member 5+ Years 1000 Posts

    Jeff,

    You should have changed your baby's transmission fluid when you bought her. Now she's in dire straights. First thing to do is go to Auto Zone and have her scanned for codes. How's her fluid condition? Post the codes and it won't hurt to change her fluid but don't be surprised at what you find in the pan.

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