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  1. #1
    Jr. Apprentice 1999Sierra's Avatar
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    Question 99 Sierra 1500 shifting problem

    Hello,

    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 [COLOR=blue! important][COLOR=blue! important]truck[/COLOR][/COLOR] looks and run great.

    Thanks,

    Stephen

  2. #2

    Default

    Welcome to the site!
    Hopeully the "tranny" guys will chime in on this.
    Ryan

    2002 Jeep Wrangler Sport 4x4 (the Yellow Jacket)
    4inch suspension 3inch body
    Straight 6 (383 Stroker within a year)
    36inch SuperSwamper TSL.
    105,000
    Detroit Loccers
    Daily Driver Weekend Wheeler
    much more...

    2004 Sierra crew cab, 2wd, 5.3 V8
    2inch Daystar Leveling kit
    single dumped Flowmaster 40 sieries exaust(removed)
    Mb Blitz Chrome wheels
    Leer Bed Cover(for sale)
    50k miles
    :glasses:




  3. #3
    Legend tlperry68's Avatar
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    Can you try putting the truck through the gears manually i.e. 1 , 2, 3, Drive with OD off? Or what ever you cn. But that is one weird problem, I've never heard of it.
    Trevor - Huntington Beach, CA
    2007 GMC 2500 4X4

  4. #4

  5. #5
    Jr. Apprentice 1999Sierra's Avatar
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    Default

    Hi and thanks for the suggestion. What is a "TPS" sensor?

  6. #6

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    TPS, throttle position sensor.Don't replace it thats not the problem, I think he meant to say speed sensor. Could possibly be the speed sensor but this on is difficult to diagnose.

  7. #7
    Jr. Apprentice 1999Sierra's Avatar
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    Thanks RETIRED. I'll check with the local GMC dealer (if he's still in business!!!) for a spped sensor but I still can't figure out why it would be temerature sensitive. Still, it's worth a shot.

    Any more ideas?

  8. #8
    Jr. Apprentice 1999Sierra's Avatar
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    Thanks for the suggestion. I have done that and it shifts into first no problem and second no problem but when you selct 3 or 4, if the temerature is below freezing, it will hang up in second gear. After a couple of miles it will then go into third gear and, agter another couple of miles, it will go into fourth.

    When the temerature is ABOVE freezing it shifts through all gears real smooth with no problems at all. Weird huh?

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