Question about 2002 Chevrolet TrailBlazer

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2004 Chevy Trailblazer transmission shifts but at High RPM's

Picked up a free trailblazer with transmission problems for my daughter. When I first drove it it would not shift into 2nd and would not go over 20mph. My brother drop the pan, drained the fluid, replaced the seals, filter and put new fluid in. Now the car drives up to 65mph but it still has high RPM's (then let up off the gas) it shifts into 2nd...does same thing at 3rd gear but not as bad. There was a lot of shavings in the fluid, water and oil looked burnt. Filter was clogged. Any hope of doing anything else to maybe make this car shift better? Other than replacement. ALso, it drives in all gears, no thumping when put into park or drive or reverse. Thanks in advance.

Posted by Judy Wilson on

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2 Answers

Daniel Mc Entee

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  • Chevrolet Master
  • 1,449 Answers

He should have checked the codes first. before doing the work .as in the transmission pan is a pressure sensor, and a governor pressure sensor that sensor has an electrical connection on it.both are known to fail.try check the codes . but it can also be your linkage is needing adjustment.and your kick down cable needing adjustment .or sticking from rust and dirt.

Posted on Dec 21, 2013

Testimonial: "Thank you for the advice. I will need to go to a mechanic to get codes. My brother does not have the machine for codes. Yes, I know, ....Thank you"

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Bill Boyd

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  • Chevrolet Master
  • 53,816 Answers

Have a pressure test done on the transmission to check for internal problems. run fault codes to check for TCM and other related faults. Have a band and clutch pack adjustment done . If it all checks out but the problem persists then you may have to consider a removal and overhaul option.

Posted on Dec 21, 2013

  • 6 more comments 
  • Judy Wilson
    Judy Wilson Dec 29, 2013

    Ive had time to get the codes checked. There are no codes. The catalytic converter says its not ready.

  • Bill Boyd Dec 29, 2013

    If there are no transmission codes then the problems will be pressure and adjustment.What do you mean by cat converter syays it is not ready?

  • Judy Wilson
    Judy Wilson Dec 29, 2013

    I will have pressure tested. What I mean by catalytic converter is the code thing they plugged in had no codes and said "catalytic converter not ready". So from my understanding, its going bad possibly because they said if I wanted to smog it to do it now. I also came across while this car was running, parked, that when I used the driver side power seat switch to move the seat back, it made the engine lose some brief power. So I will put that on the list of getting things checked.This engine was replaced 9 months ago. I am really wondering if they put something in wrong. Every since it was changed it had these problems. This was my sisters car , she gave it to me for my daughter. So it is worth a few dollars to get fixed and running, just in case your wondering why I am bothering.

  • Judy Wilson
    Judy Wilson Dec 29, 2013

    And it has some sort of knocking noise like a rod but it is not the engine, the noise is more underneath the car. I guess soon to be figured out Tuesday.

  • Bill Boyd Dec 29, 2013

    the noise may be a bad engine mount . From what you say it may have been a better deal to have passed . . A faulty cat converter will show on as a code or iot will be cracked and is useless.. I think from your description of the car that you might consider a trade to something more reliable for your daughter

  • Judy Wilson
    Judy Wilson Dec 29, 2013

    You may be right about another better deal. I have about $40 into this with the fluid , seal, filter with the transmission oil check. I do not plan on putting excessive monies into the vehicle unless the problem can be pinpointed by a "certified mechanic". We have a good one in town and the car will be going Tuesday for evaluation. Totally agree with you, if the car is a mess now, get another since it will be a first car for my daughter.

  • Judy Wilson
    Judy Wilson Dec 29, 2013

    Hint the enter to quick...........anyhow I wanted to note this: I did a selfie check on the motor mount. Lifted the hood and gave it gas in reverse and drive, with the brake on. The motor does lift up to where I can see it moving in both gears. more so in reverse. You may be right about the motor mount being broken. On that note, my sister had this motor put in about 9 months ago as I stated. Around 3 months it started the knocking noise. Then a few months later, the transmission was not shifting properly. She did not want to bother with it anymore so she bought a new car. This car has been sitting for three months or so before it got towed here. Anyways, bad motor mount, driving it with it bad, leads to possible bad transmission problems? Also the car vibrates on the passenger side at stops and shut off. We'll see come Tuesday! Thanks for your responses to! And I will post again so others can read if they have similiar problems.

  • Judy Wilson
    Judy Wilson Dec 29, 2013

    This video is at 2K rpm....check for motor mount problem... Thanks for all your replies...http://www.youtube.com/watch?v=n2qW_95t_...

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1 Related Answer

Doug Keller

  • 208 Answers

SOURCE: 1993 Chevy Silverado 4x4 1500

If you have no overdrive at all, and virtually no third, then it's time for an overhaul. The 3-4 clutches have failed, a common problem in this trans since 1981. Yes, 1981. Your trans is a 4L60-E that is computer controlled. In 1981 it was called a THM700-R4, and was hydraulically controlled. The input clutch drum is basically the same as it was in 1981, and the 3-4 clutches are prone to failure, usually around 130,000 to 150,000 kms (75,000 to 90,000 miles).

Posted on Apr 18, 2011

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