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Discuss gmc z71 transmission shifting hard in the alt.autos.gm forum at Car Dealer Forums; I have a 1995 GMC k1500 z71 w/ 165000 miles on it I have done ...
  1. #1
    sticknor777@gmail.com
    Guest

    Default gmc z71 transmission shifting hard

    I have a 1995 GMC k1500 z71 w/ 165000 miles on it I have done a full
    tune up on it. It just recently started to act up, what it started to
    do was when I started the truck in the morning the check engine light
    would come on and it would shift very hard like a motor mount was
    broken. I would turn it off and let it set for a second and it would
    stop the problem. I has progressively got worse. Now it does it
    almost everytime I start the truck and when it doesn't initially do it
    does after a few minutes of driving. I took it to my mechanic he said
    it was a computer problem so I replaced the computer w/ no luck. He
    put it on the computer to see if it said anything but it didn't say
    what it was only that it was a tranny problem. He believes it is a
    sensor but he is not sure which one now he says he will have to take
    the tranny apart and test each sensor to find the problem. He is a
    honest mechanic and a very good friend so he is not lying. If anyone
    could poss give me some insight as to what it might be that would be
    awesome. Thanks in advance and GOD BLESS


  2. #2
    core
    Guest

    Default Re: gmc z71 transmission shifting hard

    On 12 Aug 2006 19:58:53 -0700, sticknor777@gmail.com wrote:

    >I have a 1995 GMC k1500 z71 w/ 165000 miles on it I have done a full
    >tune up on it. It just recently started to act up, what it started to
    >do was when I started the truck in the morning the check engine light
    >would come on and it would shift very hard like a motor mount was
    >broken. I would turn it off and let it set for a second and it would
    >stop the problem. I has progressively got worse.


    Before you tear it apart, get yourself a can of this:
    http://www.seafoamsales.com/transTuneConsumer.htm

    If you are skeptical, do your own search on the net for seafoam engine
    products....




  3. #3
    Kevin Smith
    Guest

    Default Re: gmc z71 transmission shifting hard

    When my '97 chevy z71 did it at 55,000 mi the dealership had to replace the
    valvebody in the trans.
    <sticknor777@gmail.com> wrote in message
    news:1155437933.935831.89410@i42g2000cwa.googlegro ups.com...
    >I have a 1995 GMC k1500 z71 w/ 165000 miles on it I have done a full
    > tune up on it. It just recently started to act up, what it started to
    > do was when I started the truck in the morning the check engine light
    > would come on and it would shift very hard like a motor mount was
    > broken. I would turn it off and let it set for a second and it would
    > stop the problem. I has progressively got worse. Now it does it
    > almost everytime I start the truck and when it doesn't initially do it
    > does after a few minutes of driving. I took it to my mechanic he said
    > it was a computer problem so I replaced the computer w/ no luck. He
    > put it on the computer to see if it said anything but it didn't say
    > what it was only that it was a tranny problem. He believes it is a
    > sensor but he is not sure which one now he says he will have to take
    > the tranny apart and test each sensor to find the problem. He is a
    > honest mechanic and a very good friend so he is not lying. If anyone
    > could poss give me some insight as to what it might be that would be
    > awesome. Thanks in advance and GOD BLESS
    >




  4. #4
    sdlomi2
    Guest

    Default Re: gmc z71 transmission shifting hard


    <sticknor777@gmail.com> wrote in message
    news:1155437933.935831.89410@i42g2000cwa.googlegro ups.com...
    >I have a 1995 GMC k1500 z71 w/ 165000 miles on it I have done a full
    > tune up on it. It just recently started to act up, what it started to
    > do was when I started the truck in the morning the check engine light
    > would come on and it would shift very hard like a motor mount was
    > broken. I would turn it off and let it set for a second and it would
    > stop the problem. I has progressively got worse. Now it does it
    > almost everytime I start the truck and when it doesn't initially do it
    > does after a few minutes of driving. I took it to my mechanic he said
    > it was a computer problem so I replaced the computer w/ no luck. He
    > put it on the computer to see if it said anything but it didn't say
    > what it was only that it was a tranny problem. He believes it is a
    > sensor but he is not sure which one now he says he will have to take
    > the tranny apart and test each sensor to find the problem. He is a
    > honest mechanic and a very good friend so he is not lying. If anyone
    > could poss give me some insight as to what it might be that would be
    > awesome. Thanks in advance and GOD BLESS
    >

    I recall reading on one auto forum(this one or 'rec.autos.tech')
    recently that GM's scanner is more sensitive to pinponting problems on
    GM-vehicles than aftermarket systems used by independent shops. It won't
    cost a big fortune to let a reputable GM d'ship scan your truck. Just a
    suggestion. s



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