Question about 2004 Chevrolet TrailBlazer

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1990 chevy sub wont shift out ot first

I have a 1990 chev suburban 1500 4 wheel drive 5.7 16 bolt pan 700 r4. a while back the trans started shifting hard, then go super soft, then back to hard. then it wouldnt shift till it almost redlined a couple of times then it will shift when u lift the pedal..then seemed to do ok..changed fluid and filter helped a little bit ..now it wont shift out of first even manually. this started after i put slick 50 in it..before slick 50 no problems at all..I KNEW BETTER..

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  • twh396 May 17, 2009

    if it does'nt have a modulator valve would i change the trans control soleniod?

  • twh396 May 17, 2009

    thank you very much...i appriciate your time thank you

  • twh396 May 18, 2009

    ok, i replaced that part with no luck. ive been reading alot of other adds about car/truck not shifting and alot of the reply is to change the speed sensor. does this really cause it to not shift?

  • twh396 May 19, 2009

    k thanks

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  • Chevrolet Master
  • 2,007 Answers

Change modulator valve on transmission.

Posted on May 16, 2009

  • Dar
    Dar May 17, 2009

    same thing

  • Dar
    Dar May 18, 2009

    Yes.

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