1999 GMC Sierra 1500 SLT Z71

Discussion in 'Chevy Silverado Forum (GMC Sierra)' started by 1999Sierra, Jan 7, 2009.

  1. 1999Sierra

    1999Sierra New Member


    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: Jan 7, 2009
  2. retired2001

    retired2001 Epic Member 5+ Years 5000 Posts

    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?
  3. 1999Sierra

    1999Sierra New Member

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

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