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  1. #1

    Default 2003 gmc sierra Z71 5.3 tranny problems

    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. #2

    Default

    Quote Originally Posted by jeffz0rz View Post
    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
    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.
    Jim

    2004 SILVERADO 2500HD LS
    Pro Comp Leveling Kit
    285-75-16 Cooper ST All Terrains
    Pro Comp Programmer
    Bilstein Shocks
    Linux Bed Liner
    Tinted Windows



    Other rides:

    1967 Landcruiser <350 Chevy>
    1970 Camaro
    1990 Geo Metro Convertible
    2007 FJ Cruiser

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