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  1. #1
    Jr. Apprentice 1999Sierra's Avatar
    Join Date
    Jan 2009
    Hendersonville, NC

    Question 1999 GMC Sierra 1500 SLT Z71


    I'm new to the forum but have been a long time GMC truck owner.

    My 1999 Sierra 1500 4 X 4 SLT Z71 with 135,000 miles on it doesn't want to shift gears when the temerature drops below freezing.

    It will stay in 2nd for about a mile then shift t 3rd. After another couple of miles it will then shift to 4th and, again, after another mile or so shift into overdrive. After this it will then shift fine.

    I've recently had the ATF drained and refilled with Dexron 3.

    I'm hoping somebody can help me fix this minor issue as, apart from this problem, the truck looks and run great.


    Last edited by 1999Sierra; 01-07-2009 at 02:46 PM.

  2. #2


    Welcome to the site. Mine has 114,000 miles and has not had any tranny problems. Was yours acting ukp prior to servicing the transmission?

    2010 Z/71 Colorado C/C
    Black 4X4 w/5.3L V8
    2007 Winnebago Adventurer
    w/8.1L Chevy & Allison 6spd.
    Canyon Lake, Texas

  3. #3
    Jr. Apprentice 1999Sierra's Avatar
    Join Date
    Jan 2009
    Hendersonville, NC


    Yes. The reason I had the ATF changed was to try to fix the problem.

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