Question about 2002 Pontiac Montana

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Have a 2002 Montana and the transmission was shifting rough. We have the fluid flushed and changed this morning figuring it was the cheapest place to start. Its still shifting rough. What is the next step I should take to isolate the trouble with it, change the solenoid ?

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  • marcieandles Dec 10, 2009

    We dont get any lights at all. Thats what the puzzles me .

  • marcieandles Dec 10, 2009

    Would the flushing they did not have corrected the trouble? Where can you get "Wynns" from and how many miles should I drive it before flushing it again ?

  • marcieandles Dec 10, 2009

    It just seems to do it when the transmission warms up. Its not a slipping its more like a "clunk" when it shifts between gears. Should I still try the Lucas ?

  • marcieandles Dec 10, 2009

    OK, I will try that. What is the name of the stuff I should be looking for ? I just pour it down the dip stick tube to add it ?

  • marcieandles Dec 10, 2009

    I will give it a shot and let you know what happens. Can I go more than 500 miles? I am not working right now and can't really afford another $100.00 to have the transmission flushed again anytime soon.

  • marcieandles Dec 10, 2009

    I will give it a shot and let you know what happens. Can I go more than 500 miles? I am not working right now and can't really afford another $100.00 to have the transmission flushed again anytime soon.

  • marcieandles Dec 10, 2009

    Add it through the dip stick tube I assume ?

  • marcieandles Dec 10, 2009

    One last question, sorry to be a pain. I want to get the lucas trans additive and not the fix? It will say specificly "additive" on the bottle ? How much do I put in my transmission ?

    Thanks for being patient with me ......

  • marcieandles Dec 10, 2009

    How long before I now if this stuff is going to work ?

  • marcieandles Dec 10, 2009

    Yes, I purchased it and added it to the transmission trough the dip stick with motor running and trans fluid hot and drove home.

  • marcieandles Dec 10, 2009

    Yes, it is still shifting the same. I will give it a few days to work. If this is not the problem what else could it be besides the solenoid?

  • marcieandles Dec 10, 2009

    OK, thanks for your time. I will wait a few days and let you now what happens.

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  • 986 Answers

Your tcm may be bad,does your engine light come when it shifts rough?

Posted on Dec 10, 2009

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  • 8 more comments 
  • Donnie Wilson
    Donnie Wilson Dec 10, 2009

    you have a valve sticking you can put some kind of addtive and drive it and flush it out again,wynns make a good additive

  • Donnie Wilson
    Donnie Wilson Dec 10, 2009

    I would at least drive 500 miles and lucas make a damn good additive and you can get that at any parts store

  • Donnie Wilson
    Donnie Wilson Dec 10, 2009

    yes It will not hurt it will only help

  • Donnie Wilson
    Donnie Wilson Dec 10, 2009

    try lucas trans additive its about the best.If you are ready to trade use transx,but I do not advise to use transx and keep the car,Thanks and please dont forget to vote on this solution

  • Donnie Wilson
    Donnie Wilson Dec 10, 2009

    If it works just keep on driveing it it will not hurt it,

  • Donnie Wilson
    Donnie Wilson Dec 10, 2009

    yes

  • Donnie Wilson
    Donnie Wilson Dec 10, 2009

    it comes in a pint add the whole thing ,please dont forget to vote on this,

  • Donnie Wilson
    Donnie Wilson Dec 10, 2009

    you got to get the trans hot and let it curculate ,might be today or a coulple of days and may not work at all,did you already get it and put it in?

  • Donnie Wilson
    Donnie Wilson Dec 10, 2009

    still shifted the same I guess, i might take a while

  • Donnie Wilson
    Donnie Wilson Dec 10, 2009

    could be a burr on the valve,it does have something to do with preasure

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